PLANTS NOVJE THURBERIAN^. 317 



subulatis obtusis tubo dimidio brevioribus ; legumine canescente. — San Isabel, Cali- 

 fornia, on rocks; May, 1852. Also gathered by Fremont, on the eastern side of the 

 Sierra Nevada. — Decumbent branches or stems two feet long, densely white-tomentose. 

 Stipules obsolete. Leaves and calyx clothed with a very dense, appressed, silvery and 

 silky tomentum : leaflets 3 to 6 lines long, all roundish-obovate. Flowers (as large as 

 in H. tomentosa) in nearly sessile or very short-peduncled axillary capituli, which are 

 crowded along the upper part of the virgate branches, so as to form a kind of inter- 

 rupted spike, the clusters mostly exceeding the subtending leaf Pedicels none. Co- 

 rolla yellow. Legume falcate, compressed, rostrate, containing one large and oblong 

 seed. — The Ilosachia tomentosa of Bentham, which is probably that of Hooker and 

 Arnott (who perhaps wrote "folium" in place of foliobim in describing the bract, and 

 also the Syrmatium tomentosum of Vogel), is incorrectly said to have the calyx-teeth 

 shorter than the tube, nor are the " flowers much smaller than those of H. decumbcns " 

 as stated in Torr. and Gray, Fl. N. Amer. The corolla, however, is decidedly shorter 

 in proportion to the calyx ; the teeth of Avhich are very slender, or subulate-setaceous, 

 and for the most part fully as long as the tube. In the present species the teeth are 

 very much shorter and blunter, and the whole calyx, like the foliage, is densely clothed 

 with a very different silvery-silky tomentum ; the stems are woody at the base, &c. 

 Syrmatium, Vogel (the Drepanolohus of Nuttall) is too closely connected with HosacTcia 

 to be generically separated. The whole genus, augmented by several still unpublished 

 species, greatly needs a thorough revision. 



829. Acacia 1 crassifolia (sp. nov.): fruticosa, aculeis sparsis et substipularibus 

 vix recurvis armata ; ramis foliisque glabris glaucescentibus ; pinnis unijugis glandula 

 petiolari interposita ; foliolis unijugis pro genere maximis (sesqui-bipollicaribus) dila- 

 tatis cuneato-rotundis impetiolulatis crasso-coriaceis utrinque consimilibus flabellato- 

 7-nerviis et reticulato-venosis ; pedunculis generalibus axillaribus et terminalibus folia 

 excedentibus racemoso-capituliferis, partialibus solitariis ssepiusve binis vel ternis pu- 

 bescentibus ultra medium obsolete unibracteolatis ; capitulis globosis ; lobis coroUaj in- 

 fundibuliformis calyceque paullo breviore canescenti-pubescentibus. — In the mountain 

 pass- of La Peiia, Cohahuila ; November, 1852. — The specimen of this most anomalous 

 Acacia, as it appears to be, is in flower only. It is said to belong to a shrub of 6 to 10 

 feet in height. Branches armed with a few scattered, rather stout prickles of 2 or 3 

 lines in length, and usually with a pair of similar ones subtending the petiole. The 

 latter a quarter or half an inch long, occasionally armed with a solitary prickle under- 

 neath, and at its apex above, between the pinnse (which are reduced to a single pair), 



