18 
8. D.rubescens Watson. With the simple tall erect stems and dense oblong 
spikes of D. aurea, but more slender, the leaves pinnately 3-foliolate, flowers smal- 
ler, and the yellow petals becoming purplish. (D. nana, var. elatior Gray.)—In the 
mountains west of the Pecos; also reported by Reverchon at ‘head of South Llano.” 
9, D. Wrightii Gray. Low, white-sericeous and glandJess: stems very many from 
a woody root, 5 to 15 cm. high: leaflets 5, lanceolate, acute: flowers yellow, in oblong 
sessile spikes: bracts membranaceous, lanceolate, acuminate : calyx-teeth subulate, 
very long plumose, much longer than the tube, equaling the corolla.—Hillsides and 
mountains west of the San Pedro, and especially beyond the Pecos. 
== Leaflets appressed-sericeous, palmately 3-foliolate. 
10. D. Jamesii Torr. & Gray. Whole plant silky and glandless: leaflets obovate, 
very obtuse ; stipules spiny: spikes dense and broad, oblong, sessile; bracts ovate, 
acuminate, longer than the calyx, which has setaceous and plumose teeth: flowers 
purple with a yellowish standard.—Stony hills west of the Pecos. 
= = = Leaflets loosely villous, 4 to 8 pairs. 
11. D. lachnostachys Gray. Covered with tuberculate (mostly conical) glands, 
much branched, rather diffuse, 3 dm. or more high: leaflets 4 or 5 pairs, about 12 
mm. long, oval or obovate, villous on both sides, beset beneath close to the repand or 
subcrenulate margins with a row of very large flat glands: spikes thick and densely 
barbate-woolly, on short peduncles; bracts ovate, scarious, produced into a long 
acumination about equaling the flower: calyx very villous, its aristate teeth as long 
as the purple corolla.—Hills west of the Pecos. 
12, D. mollis Benth. Low and branching, 7.5 to 15 em. high, silky villous with 
more or less spreading hairs: leaflets 4 to 8 pairs, obovate to cuneate-oblong, 2 to 8 
mm. long: flowers white or rose-colored, in oblong, shortly-pedunculate spikes: 
bracts lanceolate, acuminate, villous: calyx very villous, the filiform plumose teeth 
much longer than the tube and exceeding the corolla.—Along the Rio Grande and 
west of the Pecos. 
++ ++ Spikes rather lax: corolla purple. 
13. D. lanata Spreng. Decumbent and whole plant clothed with a soft almost 
woolly pubescence : leaflets 4 to 6 pairs, obovate-cuneate, emarginate, 10 to 12 mm, 
long : spikes elongated, rather loose, many-flowered, on rather long peduncles ; bracts 
ovate, with a long acumination: calyx-teeth subulate, plumose, dilated at base, as 
long as the tube: petals deep-purple.—Very common in sandy soil along the upper 
Rio Grande and on the ‘‘Staked Plains.” 
14. D. Domingensis DC. Erect and more or less pubescent: leaflets 6 to 7 pairs, 
obovate, obtuse or emarginate: spikes somewhat capitate, shortly peduncled ; 
bracts ovate, acute, shorter than the villous calyx: calyx-teeth subulate.—Var. 
PAUCIFOLIA Coulter has the whole plant more hairy: leaflets but 3 or 4 pairs and 
larger: inflorescence becoming more or less compact-clustered in the upper axils, 
and the calyx-tube nearly glabrous, making very prominent the large amber-colored 
glands.—Along the lower Rio Grande and in adjacent Mexico. 
** Calyx pubescent or canescent, with short teeth: shrubby plants. 
15. D. argyreea Gray. Stems 3 to 6 dm. high, stout, corymbosely branched above, 
the branches canescent, glandular-tuberculate, leafy: leaflets 7 to 13, obovate-oblong, 
silvery-sericeous and shining: spikes short, densely flowered, at first capitate, on 
short peduncles: calyx cinereous-pubescent, somewhat longer than the ovate acu- 
minate bract: corolla showy, yellowish purple.—Rocky hills between the Nueces and 
the Rio Grande, and west of the Pecos. 
16. D. scoparia Gray. A ‘‘broom-like ” plant, with rigid slender branching 
stems, naked below and roughened all over with large pustulate glands, the diffuse 
branchlets terminated by small globular heads of deep violet flowers : leaves mostly 
simple on the branches and linear, the lower ones with 3 linear leaflets: bracts very 
small and ovate.—Sandy bottom of the Rio Grande west of the Pecos. 
