46 planTjE wrightian^. vi. 



Benthain has suggested to me as probably a Chaetocalyx,) chiefly in the distinctly 

 flattened loment. 



ZoRNiA RETICULATA. Smith; DC. Prodr. 2. p. 316. Hills near Santa Cruz, So- 

 nera; Sept. (1008.) — The short aculei of the loment are not smooth, but re- 

 trorsely scabrous under a lens. 



Desmodium gramineum (sp. nov.) : glaberrimum ; caulibus e radice perenni erectis 

 gracillimis ; stipulis minutis subulatis ; foliis omnibus unifoliolatis ; foliolo anguste 

 lineari prselongo subtus nervato-venoso ; racemis paniculatis ; lomento 3 - -l-articu- 

 lato breviter stipitato, articulis ovalibus. — Crevices of rocks on the Sonoita, near 

 Deserted Rancho, Sonora; Sept. (1009.) — A unifoliolate species of the section 

 Chalarium, remarkable for its long and slender grass-like leaflets. These are from 

 three to five or even six inches long, and from one to two, the very largest three, 

 lines wide, membranaceous in texture, and perfectly glabrous, like the rest of 

 the plant. The slender stems are one or two feet high. Bracts minute. Flowers 

 small. Articles of the loment li to 2 lines long, much deeper separated than in 

 D. linearifolium. 



D. ANNUUM (sp. nov.) : pilosulum; caule tenello e radice annua erecto subsim- 

 plici ; stipulis stipellisque setaceis cum petiolo longiusculo semper unifoliolato 

 pilosis ; foliolo ovali membranaceo concolore ciliato ; racemis paucifloris ; lomento 

 deflexo vix stipitato, articulis 4-5 orbiculatis ciliolatis medio adnexis. — Sonora, 

 with the preceding and the succeeding. (1009^) — Stem 4 to 8 inches high, 

 slender, erect or ascending, 8-10-leaved, Leaves all unifoliolate, very thin, oval or 

 ovate-oblong, or the uppermost narrowly oblong, obtuse at both ends, not in the 

 least inclined to be cordate ; the larger li inches long and an inch wide ; the earlier 

 ones much smaller ; the primordial ones opposite. Pedicels 3 to 5 lines long. 

 Flower 2 lines long. Loments 6 to 9 lines long, straight ; the articles when young 

 inclined to twist or infold, giabrate, or at length glabrous, except the margin. — 

 This is wholly distinct from the perennial D. Wrightii, and is a smaller and more 

 delicate plant. 



D. exigudm (sp. nov.) : annuum, puberulum ; caule tenello erecto ramoso ; 

 stipulis bracteisque setaceis ; foliis plerisque unifoliolatis, foliolo inferiorum deltoideo 

 vel rhomboideo summorum lineari, paucis intermediis nunc trifoliolatis foliolis line- 

 aribus vel lanceolatis ; racemis filiformibus ; lomento 2 - 3-articulato longiuscule 

 stipitato, articulis rhombeis scabris. — Mountain ravines, on the Sonoita, Sonora ; 

 Sept. (1010.) — Stem a span high, difi'usely branched. Leaflets hirtello-puberu- 

 lent, not reticulated, obtuse ; those of the lowest leaves 3 to 5 lines long and 5 or 

 6 broad ; the next longer, and often deltoid-oblong, passing into lanceolate ; the 

 upper, and those of the trifoliolate leaves when present, 6-9 lines long, and one or 

 two wide. Pedicels capillary, an inch long. Flowers very small. Stipe of the 

 loment three or four times the length of the calyx. Articles li to 2 lines long. — 

 From D. Wislizeni this well-marked species (which belongs, like all the following, 

 to the section Chalarium) diflers in its annual root, its less reticulated and smaller 

 leaflets, the lower strikingly dilated, and in the scabrous articles of the loment, 

 which are more contracted at each end. 



