198 PROCEEDINGS OF THE AMERICAN ACADEMY 



long. Legumes 4 lines long, glabrous, the pericai'p thickened on the 

 back each side of the deep gi'oove. 



§ 8. Didymocarpi. Legumen tenuiter coriaceum, obcompresso-didy- 

 mum, transversim costato-rugosum vel reticulatum, septo angusto 

 bilocellatum, maturitate in cocoa dua intus rima hiascentia mono- 

 disperma (nunquam ultra biovulata) secedentia. Ovarium breviter 

 stipitatum. — Caulescentes e radice annua, parvuli, parce pubes- 

 centes ; stipulis discretis fere liberis ; foliolis emarginatis. Spicte 

 breves densitlor^e. Flores parvi, violacei, nunc fere albi, carina 

 apice arete intlexa. Legumina stepissime deflexa. 



16. A. DiDTMOCARPUS, Hook. & Am. Bot. Beech, p. 334, t. 81. 

 A. Catalinensis ^ A. nigrescens (§ Microlohiiirn), Nutt. PL Gamb., in 

 Jour. Acad. Philad. n. ser. 1, p. 152. Triuncialis ad pedalem ; floribus 

 sessilibus in capitulo vel spica demum cylindracea ; legumine didymo 

 parvo valde rugoso (cinereo-hirsutulo scabro vel demum glabro) in 

 calyce brevissime stipitato, locellis uni-ovulatis semine solitario fere 

 repletis. — California. Occurs under a variety of forms, of which Dr. 

 Brewer, of the Geological Survey of that State, has recently collected 

 an instructive series. Ovary truly stipitate ; but the stipe of the 

 legume is very short and occult. 



17. A. Brazoensis, Buckley in Proceed. Acad. Philad. Dec. 1861, 

 p. 452. Annuus ? spithamteus ; floribus brevissime pedicellatis laxius- 

 culis ; legumine maturo valde obcompresso fere scutelliformi incurvo 

 glabro transversim nervoso versus margines reticulato, stipite e ca- 

 lyce exserto, locellis biovulatis plerumque monospermis. — W. Texas, 

 Buckley. Valley of the Nueces, Major G. H. Thomas, in herb. Torr. — 

 In a notice of Mr. Buckley's Texan plants, contributed to the Pro- 

 ceedings of the Philadelphia Academy, April, 1862,1 wrongly referred 

 Mr. Buckley's very imperfect specimens of this plant to the little 

 known A. rejiexus, Torr. & Gray. But the good specimens, with 

 mature fruit, which I now find in Dr. Torrey's herbarium, collected by 

 Major Thomas, show that the species is wholly distinct, and is really 

 allied to A. didymocarpus, as its propounder supposed. The disciform 

 and somewhat acetabuliform legume is a quarter of an inch in diam- 

 eter ; its stipe about the length of the calyx. 



§ 9. Micranthi. Legumen coriaceum, oblongum, lanceolatum, seu 

 lineare, rectum vel curvatum, baud stipitatum, postice sulcatum, 

 sutura dorsali intrusa ventralem extus prominulam attingente bi- 



