176 Plantce Lindheimeriance. 



instead of a subulate stipel, on the rachis at the insertion of 

 each leaflet. 1 



(596.) Astragalus caryocarpus, Ker, Rot. Reg. t. 176 ; 

 Torr. &/• Gray, Fl. 1. p. 331. Clayey soil, near Victoria. 

 February, in flower. Also (598) in Western Texas, in flower 

 and fruit. 



(597.) A. Mexicanus, Alph. DC. PI. Rar. Hort. Genev. 

 not. 5. p. 17. t. 3. A. trichocalyx, Nutt. in Torr. fy Gray, 

 Fl. I. c. Prairies on the Lower Guadaloupe, west of Victoria. 

 February, in flower. — This and the last species, although 

 often confounded in herbaria, are manifestly distinct in the 

 living state. A. caryocarpus has more strigose and somewhat 

 canescent, oblong or linear-oblong leaflets, close and fine 

 hairs on the calyx, sometimes blackish, a violet purple corolla, 

 the flower about two thirds of an inch long, and ovate pointed 

 legumes, which are seldom more than two thirds of an inch 

 in diameter. A. Mexicanus is a larger plant in all its parts, 

 with smoother and greener foliage ; the leaflets varying from 

 roundish-obovate to oblong ; the flowers an inch long ; the 

 calyx villous, (often very densely) with soft, white hairs ; the 

 corolla barely tinged above with pale violet, or nearly white; 

 and the very turgid globose-ovoid legumes are obtuse and 

 over an inch in diameter. 2 



1 Petalostemon virgatum, Scheele in Linncea, 21, p. 461, is plainly the No. 42, PL 

 Lindh. and No. 137, PL Fendl., viz. a pubescent variety of P. violaceum, perhaps 

 connecting that species with P. decumbens. The leaves in some specimens are in- 

 deed 7-foliolate, in others both 5-foliolate and 3-foliolate. — Trifolium Rcemerianum, 

 Scheele, I. c. is manifestly the T. amphianthum, Torr. $' Gray, Fl. 1. p. 316. 



2 This Texan plant is clearly De Candolle's A. Mexicanus ; but Dr. Engelmann 

 thinks it distinct from the A. trichocalyx, of Missouri ; on account of the still larger 

 and pale purple flowers, and shorter calyx-teeth. The remarks above are chiefly 

 founded on living plants of A. trichocalyx and A. caryocarpus, raised from seeds 

 furnished by Dr. Engelmann from St. Louis. 



Mr. "Wright has communicated specimens of a new Texan species of Astragalus, 

 and also seeds from which the plant has been raised, during the past summer in the 

 Cambridge Botanic Garden. 



Astragalus Weightii (sp. nov.): annuus, pumilus, hirsuto-canescens ; caule 

 subsimplici ; stipulis subulatis liberis ; foliolis 3-5-jugis oblongis acutiusculis; pedun- 

 culis folio longioribus paucifloris ; floribus capitatis ; calyce hirsutissimo, lobis lineari- 

 subulatis attenuatis corollam violaceam superantibus legumine oblongo hirsuto sub- 

 tereti fere biloculari 6-4-spermo dimidio brevioribus. — Texas, near Austin, Mr. 



