136 



LEGUMINOSiE. [Psoralea. 



deciduae. Calyx brevi-campanulatus, appresse pilosus, glandulosus, dentibus brevibus subsequalibus acutia 

 ciliatis. Flores parvi, (caerulei, Ph.') Vexillum subrotundum, ung^iculatum. Carina obtusa, cum alts 

 oblonnr^s obtusis coadunata. Stamina diadelpha, 9-1. Legumen globosum, mag;nitudine seminis Pisi sativi, 

 glaudulosum, pilis albidis appressis brevibus tectum, stylo subulato terminatum. Semen subro tun datum, 

 solitariumj compressum, Iseve, fuscum, 



Hab. This, which was first discovered by Lewis on the banks of the Missouri, is found by Mr, Douglas 

 inhabiting- dry, parched, and sandy soils, from the mouth of the Columbia to its source : and by Mr, Drum- 

 mond on Jhe east side of the Rocky Mountains, on the Saskatchawan, from Carlton-House to Edmonton- 

 House. — I have followed Mr. Nuttall in considering the P. elliptica of Pursh the same as the P. lanceolata ; 

 but I see no reason why one of these two original names should not be retained. 



Tab. LT, Fig, 1, Flower; Jig, 9, Vexillum; Jig. 3, Alte and carina combined; Jig. 4, Stamens, including- 

 the Pistil ; Jig, 5, Legumen ; Jig. 6, Seed : — natural size. Fig. 7, Legume ; Jig. 8, Seed : — all but Jigs. 

 3 and 6, magnijied. 



2. P. physodes ; glabriuscula, foliis pinnatim 3-rarius S-foliolatis, follolis lato-rhombeo- 

 ovatis acutis mucronatis obscure glandulosis terminali longe pctiolato, racemis peduncu- 

 latis laxis axillaribus folio longioribus, calycibus valde inflatis Jiirsutis corolla vix 

 brevioribus, dentibus subeequalibus. — Douglas, MSS. in Herb* Hort, Soc, 



r 



Hab. Banks of streams, in open, sandy and gravelly soils, from the Great Falls of the Columbia to the 

 Rocky Mountains. Douglas. — This species is well distinguished by its large leajlets and their form, together 

 with the large inflated calyces, which almost conceal the flowers, and ^vholly ho the elliptical, compressed, 

 scarcely glandular, slightly hairy, 1-seeded legumes, 



f 



, 3. P, argophylla; pulcherrime argenteo-sericea, erecta, ramis divaricatisj foliis palma- 

 tim-3-5-foliolatis, follolis elliptico-lanceolatis, spiels pedunculatis folio longioribus 

 interruptis bracteatis, bracteis subbifloris, calycis dente inferiore longissimo. (Tab. 

 LII.) — Pursky Fl, Am, v, 2. p. 475. — P. incana, Nutt in Fraser^s Cat 1813. Gen, v, 2. 

 p. 102. 



Tota planta, sed preecipue folia juniora, ramuli calyces bracteae<iue pilis mollibus appressis pulcherrime 

 argenteo-sericoa, Caules erecti, ramosi, striati, rarals patentibus. Folia 3-seu 5-foliolata, follolis digitatis, 

 elliptico-Ianceolatis, acutis, breve petiolulatis, 2-3 unclas lougis. Pctiolus folio brevior. Stipuloi lineares, 

 liberse, semiunciam vel unciam fere longse. Pedunculi axillares, folio duplo longiores. Flores (purpurei. 

 Ph.; azurei, iVMW.), interrupte et verticillatim spicati, verticillis bracteatis. Bracte<B subbiflorse, calycis 

 longitudine, lanceolatae. Calyx densissime sericeo-villosus. Tubus brevls: denies subulati, 4 superiores 

 subaequales ; inferiore elongato petalis longiore. Vexillum ovatum, unguiculatum, ad basin lamiuEe bicallosuro. 

 AIcB oblongje, unguiculatae, cum carina obtusa unitae. Fnictus mihi ignotus. 



Hab. Dry soils on the banks of the Red River, in lat. 50°, (Douglas,) to the Saskatchawan in lat. 54°, 

 from Carlton-Honse to Edmonton-House. Drummond; Douglas. — Few plants can exceed this in beauty; 

 even in the dry state, its silvery hue is quite remarkable, and the flowers are either bright azure-blue, 

 according to Nuttall, or purple, according to Pursh. The former author observes that the stems are rarely 

 branched: such is not the case with our specimens. 



Tab. LII. Fig. I, Portion of a spike ; Jig. 2, Flower ; Jig. 3, Vexillum ; Jig. 4, Ake and carina : — more or 

 less magnijied. 



4. P. macrostachya ; foliis pinnatIm-3-foliolatis pubescentibus, foliolis ovatis mucronatis, 

 petiolis glanduloso-scabris, pedunculis axillaribus folio quadruple longioribus, spicis 

 cylindraceis raclii bracteis calycibusque hirsutissimis.— Z)e Cand, Prodr. v. 2. p, 220. 



Hab. Kootka. {Lagasca in De Cand.) — " JSracfe^j acuminate calycis longitudine. Spica subramosa." DC 



