VI. 



PLANT-E WRIGHTIAN^ 



41 



Petalostemon exile (sp. nov.): annum, glabmm; caule erecto tenui simplici 

 vel simpliciter ramoso ; foliolis 3 raro 5 linearibus mucronato-apiculatis parce 

 punctatis, impari lateralibus longiore; spica longe pedunculata cylindrica densa; 

 bracteis ovatis subulato-acuminatis subvillosis floribus pauUo brevioribus persisten- 

 tibus ; calyce villosissimo, dentibus setaceo-subulatis tubo aequilongis petala rosea 

 subsequantibus. — Hill-sides, near Santa Cruz, Sonora, Sept. ; also near the copper 



mines, Nevv Mexico, Oct. 



(995.) 



Stems 6 to 14 incbes higli, very slender. 



Lateral leaflets 4 to 6 lines, the terminal one 9-18 lines in length, a line or less in 

 width, plane, glabrous, or with a few minute hairs. Spike an inch or an inch and a 

 half long in fruit, 3 lines thick ; the lowest bracts broader and less subulate-pointed 

 than the upper, aiid nearly glabrous ; the others are arachnoid-villous, especially the 

 margins. Calyx 2 lines long. Petals very small, oval, nearly similar. Stamens 5. 

 The genus Dalea scarcely occurs east of the Mississippi ; and evcn in Arkansas 

 and Eastern Texas there are ten Petalostemons to five Daleas. But as we proceed 

 westward and southward, the former genus disappears, and the species of the hitter 

 largely increase. Petalostemon violaceum, the most widely diff"used specics, alone 

 reaches the northern frontiers of New Mexico ; the present species comcs from 

 farther south, and is the only one known to occur in Mexico. 



Melilotus parviflora, Desf. Near El Paso, and in Sonora ; naturalized. (996.) 



Medicago SATivA, im?L Fiekls, EI Paso and San EHsario ; introduced. (1356.) 



Tripolium ijnvolucratum, Willd. ; Benth. Pl. Hartiv. no. 54 ; Grai/, Pl. Fendl. 



p. 33. Valley of the Sierra de los Animos, New Mexico, on the borders of springs ; 



(997.) 



The margin of the leaflets is fringed with as long setaceous teeth 



Oct. 



as in any form of T. fimbriatum, Lindl ; but the calyx-teeth are much longer than 



the tube. 



\. 



t 



-H Herbacese, glabrse ; foliis multijugls ; spicis elongatis alopecuroideis- 

 Perennis, microphylla ; corolla flava. 

 Annua : corolla alba roseo tincta. 



-H -i- Herbacese vel suffruticosge, pubescentes, tomentosse, vel serlceae, 

 Spica densissima, recta ; floribus albis. 



Spica densissima, crassa, villosissima ; floribus flavis vel purpurcis. 

 Foliola appresso-scricea, 2-4-juga, raro pinnato-trlfoliolata. 

 Spica longlssimc pcdunculata, e caulc virgato erecto. 

 Spica breviter pedunculata : caules ramosi : foliola oblonga obtusa 

 Spica sessilis : foliola lanceolata acuta. 

 Foliola appresso-serlcea, tria, digitata ! 

 Foliola laxe villosa, 4- 8-juga. 



Glanduloso-tuberculata: spica crassa, bracteis pubescentibus, 

 Villoso-canescens, humilis; braclels villosissimis, 

 Splca laxiuscula ; corolla pulchre purpurea. 

 Tomentosa; caulibns diffusis ramosissimis. 

 Sericea; caulibus strictis simpliciusculis. 



• * • 



Calyx piibesccns vcl canescens, dentihis hrcvibiis. {Frutescentes.) 

 Foliola 7- l^, scriceo.argentea : corolla flavo-puq)urca. 

 Foliola 5-7, glabella: corolla alba. 

 Foliola 1-3, linearia : corolla pulchre violacea. 



» # • « 



Calj/x nisi ad margines glaher; dentihus Lreviius, 



D. L^VIGATA. y'^^ 



D. ALOPECITROIDES, ^t^^tr*^ ' 



D. ALBIFLOKA. ^r- 



D. AUREA. /V--^^ 



D- ^'ANA. c/ 



D. Wrightii. ^^ - 



D. JaMESII- ^*^ ^ ^y 



D, LAGHNOSTACHYS. ^- 

 D. MOLLIS. ^^,^~^iC 



D. LANATA. ./2 



D. WlSLIZENL ^- 



D. ARGYR-EA. 



D. LEUCOSTACHYS. 



D. 



SCOPARIA. 



y^ 



D, FRUTESCENS. 





"/ 



N 



