bus obovatis spathulatisve; floribus majusculis albis; silicula ovata puberula stylo gracili superata, loculis sub apice biovulatis. — High Sierra Nevada; on the gravelly 'divide' between East Carson and West Walker Rivers, April, Dr. C. L. Anderson. I have a small fruiting specimen of this from Douglas's collection in the interior of Oregon or California; hence the name adopted for what appears to be a very distinct new species. In the firmness of the leaves, the size of the flowers, and the slender style (a line long and almost half the length of the silicle) this approaches the Aizopsis section, but is a genuine Leucodraba. Flowers as large as those of D. ciliata: sepals oval, glabrous, half the length of the bright white petals. D. densifolia, Nutt., as to the published character comes near to our species, but, from Nuttall's incomplete specimen kindly supplied by Mr. Durand, I take that to be a form or near relative of D. glacialis, with longish style. It is quite hirsute, even to the sepals, with 2-3-forked as well as some simple hairs, and the petals appear as if they were pale yellow the cells of the ovary are 6-ovulate.

LEPIDIUM DICTYOTUM: annum, tenellum, undique puberulum; foliis angusto-linearibus integerrimis subgramineis; floribus (an semper ?) apetalis tetrandis; siliculis subtiliter reticulatis subovatis apice subalato profunde emarginatis pedicello plano erecto longioribus. - Nevada, at Steamboat Springs, Horace Mann; and in most sage-bush lands, Dr. C. L. Anderson. Specimens only 3 inches high; the grassy leaves one or two inches long: racemes strict. Silicle 2 lines long, and with a deeper notch than in those of L. lasiocarpum, Nutt. (in which, moreover, they are widely spreading), also more puberulent and more evidently reticulated.

CLEOMELLA OBTUSIFOLIA (Torr. in Pl. Wright. 1, p. 12), char. suppletus: bracteis inferioribus trifoliolatis; stipulis in crines solutis ; calycis lobis setoso-fimbriatis, seta terminali prælonga; stipite gracillimo, fructifero in pedicellum paullo longiorem refracto; stylo ovario bis longiori; capsula bicornuta; seminibus lævibus. — In sand, near Soda Lake, June 1, 1861, J. G. Cooper; branches, in flower and fruit. The scarious stipules are cut up into what appears to be a conspicuous tuft of bristles in the axil of the petiole; and the sepals are similarly but more sparingly crinite. Ovules 4-6 on each placenta. The capsule is more strongly lobed than in any other species, the back of each valve in well developed specimens being abruptly produced into a divergent horn (3 lines long, nearly as long as the style); when the 42

VOL. VII.

valve is detached it may be likened to a cornucopia with a very flaring mouth, holding 2 seeds.

SILENE BOLANDERI: multicaulis, nana, tomentulosa; caulibus 1-5floris; foliis spathulatis acutis basi (summis exceptis) longe attenuatis ; calyce oblongo-clavato haud viscoso, dentibus ovato-oblongis acutiusculis; petalis pallide roseis calyce duplo longioribus dentibus 2 minimis coronatis, ungue lato basim versus villoso-ciliato, lamina 4-6-partita, segmentis lanceolatis seu linearibus uno alterove nunc apice bifidis ; ovario brevissime stipitato. Wooded hillsides, Long Valley, Plumas Co., Bolander. Stems 3 to 5 inches high, many from a deep perpendicular root, leafy. Leaves 1 to 2 inches long, including the tapering base or winged petiole. Peduncle of the primary flower an inch and a half long. Calyx-teeth 2 or 3 lines long. "A very showy" and distinct species.

SILENE INCOMPTA: viscoso-puberula ; caulibus cæspitoso-aggregatis patulis (ultrapedalibus) foliosis thyrso laxifloro racemiformi vel paniculato terminatis; foliis oblongis seu ovali-lanceolatis acutis; pedicellis flore brevioribus; calyce cylindraceo (fructifero ovoideo vix semipollicari), dentibus lanceolatis tubo dimidio brevioribus; petalis albidis parvulis, lamina lineari-oblonga ungue apice utrinque unidentato vix latiori bifida, lobis nunc emarginatis vel bilobis, corona e dentibus subulatis. Mount Bullion, and in the Yosemite Valley, in large tufts, Bolander. Calyx sometimes purplish towards the base. Lamina of the petals only 3 lines long.

ACHYRONYCHIA, Torr. & Gray, nov. gen.

Calyx 5-fidus, persistens; tubo 10-nervi coriaceo demum cylindraceo; lobis mox radiato-patentibus ovalibus muticis præter basim calloso-incrassatam argenteo-scariosis enerviis. Petala nulla. Filamenta vel staminodia 15 fauci uniseriatim inserta, tenuia, subulata, unicum (rarissime 2?) antheriferum, cætera sterilia. Anthera didyma. Ovarium uniloculare, filo conductorio axili tenuissimo percursum: stylus brevis, bifidus. Ovula 2, basilaria, erecta, anatropa? funiculis brevibus. Utriculus tenuis, calycis tubo indurato inclusus, pyriformis, ovulo altero sterili superstite monospermus. Semen oblongo-pyriforme, facie recta rhaphi brevi cum chalaza longe infra medium notata. Embryo dorsalis, albuminis parci farinacei hinc applicitus, radicula elongata fere recta, cotyledonibus brevibus accumbenti-incurvis.— Herbula annua, depressa, Paronychiæ seu Alternantheræ sessilis facie;

foliis spathulatis oppositis, altero minore; stipulis majusculis hyalinoscariosis; floribus in axillis cymoso-congestis.

ACHYRONYCHIA COOPERI. In dry sand, Mohave River at Camp Cady, Dr. J. G. Cooper, June, 1861. In Arizona or Sonora, A. B. Gray. -Stems spreading from the slender root, 2 or 3 inches long, glabrous, as is the whole plant. Leaves thickish and veinless, the larger of each pair from a quarter to half an inch long, its fellow barely half as large. Stipules interpetiolar, one on each side, orbicular or ovate, nearly entire, silvery-scarious. Flowers in dense subsessile clusters, bright silvery-white from the scarious calyx-lobes and stipular bracts, these lobes about half a line long, at first longer than the tubinate calyx-tube, which at maturity considerably exceeds them and becomes cylindraceous and thickened in the manner of Scleranthus. The firm texture and thickening of the tube extends into the axis of the broad and plane oval or orbicular lobes for nearly one third of their length, making a strong herbaceous, or at length more indurated, callosity in the base of each; all the rest is purely scarious, and without a vestige of midrib. The filaments are very short and delicate, with their broadish bases contiguous: if any arrangement can be traced it is, perhaps, that they are single before each calyx-lobe, and in pairs before each sinus. The fertile stamen is before a calyx-lobe; and one flower out of many examined apparently bore two anthers. The ovules appear to be truly anatropous, on very short funiculi. But in the seed the chalaza, as in Pollichia, is very much nearer the pointed hilar extremity, with which it is connected by a delicate short rhaphe; the seed is straight and somewhat edged on that side, rounded above on the other; the thinnish testa delicately lineate; the slender embryo nearly the length of the seed. The very thin utricle bursts irregularly, at least when the seed is extracted. · This curious little plant confirms the judgment of Bentham and Hooker in retaining Pollichia with Paronychia and its nearest allies, notwithstanding the geminate ovules. With the aspect somewhat of Paronychia polygonifolia and the like, and a calyx which Siphonychia somewhat resembles, this combines the geminate erect ovules, one fertile the other sterile, and the straight seed and straightish embryo of Pollichia. It is most peculiar in the remarkably silveryscarious calyx-lobes, and in the numerous sterile filaments or staminodia. To separate entirely from the Caryophyllacea these plants, along with Scleranthus and the other exstipulate genera, while leaving Queria, Sphærocoma, and the Polycarpeæ generally, requires narrow and devious, and probably at length impracticable distinctions.

TALINUM PYGMÆUM (Gray, in Rep. Exped. Bryan, ined. & in Sill. Jour. 33, p. 407): foliis linearibus scapisque unifloris (nunc 2-3-floris) 1-2-pollicaribus e radice crasso confertis ; sepalis orbiculatis glanduloso-dentatis; petalis roseis purpureisve; staminibus 6; stigmatibus 3-5.- Rocky Mountains, H. Engelmann, Dr. Parry, &c.; Cascade Mountains, Washington Terr., alt. 7,500, Dr. Lyall; and now collected in the Sierra Nevada, California, by Bolander. The thick caudex or root is rather fusiform in most specimens, in Bolander's it is napiform. Ovules numerous. Seeds as in the genus.

SIDALCEA VITIFOLIA: hirsuto-pubescens; caule valido elato ramoso folioso; foliis cordato-quinquelobis, lobis brevibus crenato-dentatis subincisis; spicis brevibus capitulisve densifloris brevipedunculatis subcorymbosis; calycis nudi lobis deltoideis acutatis; petalis albis obcordatis; phalangibus indistinctis; coccis muticis lævibus. - Bear Harbor, Mendocino Co., Bolander. Plant "from 3 to 6 feet high, in tufts," the upper part or branches leafy; the branchlets terminated by short and dense spikes or heads of one or two inches in length. Stipules subulate, caducous. Leaves 2-4 inches in diameter, beset especially beneath and on the petioles, as also the branches, with a short and roughish stellate pubescence. Pedicels extremely short, subtended by a filiform bract, which is often 2-cleft or toothed at the apex and deciduous: bractlets none. Calyx very slightly or sparsely hirsute, 3-4 lines long, cleft to the middle. Corolla 6 lines long, apparently white; the petals rather narrow. Stamens of the exterior series closely approximate to the inner, consisting of 10 narrow and 2-cleft biantheriferous filaments, i. e. each fork bearing a single anther; the inner set of about as many anthers, on mostly uncombined filaments. Branches of the style and carpels 9 or 10, the latter reniform, torn open on the ventral face as they separate from the axis. This new species, so unlike the rest of the genus in appearance, is closely related to

—

SIDALCEA MALACHROIDES (Malva malachroides, Hook. & Arn.); hispida, gracilior; foliis cordato-rotundis sublobatis crenato-incisis; calyce setoso-hispidissimo 2-3-bracteolato (bracteolis setaceis deciduis), lobis triangulari-lanceolatis: cæt. fere præcedentis. The two series of stamens, the exterior of 20 in pairs, I had not before detected in this rare plant. The fruit not yet seen. In a fragment of a fertile plant collected by Dr. Andrews the column is truncate and without a single anther in all the flowers; while in Douglas and Coulter's specimens, with good anthers, the ovules are apparently good. The anthers,

if not wanting, are deciduous from the column in some flowers of S. vitifolia, as in some cultivated specimens of S. malvæflora.

MALVASTRUM ROTUNDIFOLIUM: annuum, hispidum; caule erecto; foliis subreniformi-rotundatis grossius crenatis indivisis; pedunculis gracilibus folia plerumque superantibus; bracteolis angustissime linearibus calycis segmentis sensim acuminatis paullo brevioribus; petalis roseo-purpureis basi macula rubra; carpellis ultra 40 orbiculatis muticis reticulatis. Sand hills at Fort Mohave (along with M. exile, Gray), Dr. J. G. Cooper. In aspect not unlike some South American species, but more after the fashion of a Sidalcea than any of our species. The stigmas, however, are capitate, and the filaments not clustered. Plant rather sparsely, or the calyx more densely, hispid with simple or fascicled bristly spreading hairs. Leaves somewhat resembling those of Malva rotundifolia. Stem "two feet," or in depauperate specimens barely a span high. Calyx deeply 5-cleft. Corolla 14 inches broad, apparently showy.

LINUM SPERGULINUM: annuum, fere glaberrimum; caule tenui (subpedali) superne effuse paniculato; pedicellis omnibus filiformibus flore multo longioribus mox patentissimis; foliis sparsis filiformibus; glandulis stipularibus nullis; sepalis ovalibus obtusis margine minutim glandulosis; petalis roseis albisve, ungue ima basi utrinque unidentato intus appendice linguæformi aucto; sinubus inter stamina obsolete crenulato-bidentatis; antheris oblongis; stylis 3; stigmatibus parvis.Hills at Cloverdale, Sonoma Co., June, Bolander. Glabrous throughout, except a minute and sparse pubescence on some of the branchlets and pedicels, 6-12 inches high; the flowering branches more paniculate and much more effuse than those of L. Californicum, and with flowers only about half the size, all on almost setaceous, naked, and at length mostly declined pedicels of 4-6 lines in length. Sepals barely 1 lines long. Petals 2 lines long, obovate, with a narrow claw, its ovate or oblong appendage adnate to its front, more conspicuous than that of L. Californicum. This and the following are interesting additions to the section Hesperolinon which was indicated in a former paper (6, p. 521) upon three Californian species; but these accessions require some modification of subsidiary characters; this one, for instance, in the length of the pedicels and the very diffuse inflorescence. LINUM MICRANTHUM: annuum; caule gracili superne. aperte paniculato; ramis cum pedicellis calyce sæpius longioribus quandoque puberulis; foliis alternis angusto-linearibus; glandulis stipularibus