VI. 



PLANT^ WRIGHTIANJE. 



47 



D. Neo-Mexicanum, Gray, Fl. Wright ;>, 53 ; var. glabellum, caulibus 



\ 



difFuse ramosis : foliolis membr 



glabcllo 



Borders of thickets, on stony hills along the Coppermine Creek, New Mexico 

 also in Sonora, along with the precedmg species ; Aug., Sepl. (1011.) — Steras 



span to a foot long from an annual root, erect, with the basal branches difFusely 

 spreading. Leaves thinner and less rigid than in Wrighfs No. 141 ; the primordial 

 ones unifoliolate, and oblong or oval. CoroUa purple, two lines long. Articles of 



the loment almost glabrous, plane. — Cultivated in the Cambridge Botanic Garden, 

 this forms a much-branched plant, three or four feet high, the branches very 

 slender. 



I 



D. BiGELOVii (sp. nov.) : annuum ; caulibus gracilibus procumbentibus elongatis 

 angulatis scabrido-pubescentibus ; foliis trifoliolatis ; stipulis bracteisque setaceo- 

 subulatis persistentibus ; foliolis lato-Ianceolatis obtusis membranaceis laxe venosis 

 ciliatis glabellis ; racemis laxifloris ; lomento vix stipitato 3 - 4-articulato, articulis 

 rhomboideis undulato-torquatis subpuberulis. — Valley on the San Pedro, Sonora ; 

 Sept. (1012.) — From the wild specimens I was inclined to consider this a doubt- 

 ful variety of D. Neo-Mexicanum ; but in cultivation it proves to be distinct. The 

 " slender stems trail on the ground, and attain several feet in length ; thc leaflets are 

 much broader (3 to 5 lines wide by 12 to 18 in length), blunter, and thinner; and 

 the articles of the pod are thin, undulate, aud twisted ; while in D. Neo-Mexicanum 

 they are perfectly plane. 



D. BATOCAULON (sp. uov.) : caulc elongato procumbente pilis tortis uncinatis as- 

 pero-hirto adhsesivo ; stipulis e basi lata subulato-aristatis fuscis deciduis ; foUis 

 trifoliolatis ; foliolis oblongo-Ianceolatis acutis utrinque strigoso-hirsutis cinereis 

 laxe venosis ; racemis terminalibus et axillaribus laxifloris ; bracteis subulatis cadu- 

 cis ; lomento breviter stipitato, 5 - 7-articulato, articulis rotundatis laevibus. — Stony 

 banks of small streams, on the San Pedro, Sonora; Sept. (1013.) — Stems nu- 

 merous from the perennial root, trailing, striate-angled, three feet or more in length, 

 rough with the rigid and adhesive pubescence. Leaflets 12 to 18 inches long, and 

 3 to 6 lines wide, somewhat canescent underneath. Axillary racemes few-flowered ; 

 the terminal many-flowered. Flower purple, 3 or 4 lines in length, as long as the 

 pedicel. Articles of the fruit 21 lines long, nearly smooth and glabrous. 



D. SoNORiE (sp. nov.) : caule erecto ramoso pilis apice uncinatis confertis aspero- 

 hirto adha^sivo ; stipulis bracteisque parvis e basi lata subulatis fuscis deciduis ; 

 foliis trifoliolatis ; foliolis oblongis seu lanceolato-oblongis obtusis membranaceis 

 laxe venosis utrinque parce pilosulis subtus pallidis ; racemis terminalibus elon- 

 gatis ; lomentis deflexis brevissime stipitatis, articulis 7 — 8 rotundatis scabro-hirtis. 



Low valley, on the Sonoita near Deserted Rancho, Sonora; Sept. (1014.) 

 Stem tall, the base not seen, clothed with a stiff" adhesive pubescence much like 

 that of the foregoing species ; from which, besides its upright growth, it is distin- 

 guished by its less hairy, or glabrate, thinner and larger (li-^i inches long and 

 8-10 lines wide), obtuse leaflets, and the hirsute-scabrous articles of the loment. 

 The latter are only a line and a half in diameter. It should be compared w^ith D. 

 Aparines, DC, 



