3IO CorcopsidciB and Tagetinece. [zoe 



crowded at the base of the stems, the upper ones few and small : heads 

 few on long, sparingly branched nearly leafless stems : outer bracts 

 of the involucre linear - lanceolate, shorter than the ovate, obtuse, 

 colored scales of the inner: rays 6-8, broadly oval, yellow, I cm. 

 long, nearly entire, styliferous and fertile: akenes 2-awned, those 

 of the outer florets caducous, nearly glabrous, thickened on the 

 margin and inner ridge with short protuberances, slightly exceed- 

 ing the involucre, compressed quadrangular and of equal width 

 their whole length, the outer little shorter than the inner ones. 



The following species grows near Miraflores in Baja California, 

 under the shade of trees and bushes. 



BiDENS REFRACTA. Annual, 4-5 dm. high, somewhat branched, 

 glabrous: leaves divided into three ovate, serrate, acuminate leaf- 

 lets, 8 cm. long, the terminal one much smaller : heads on stout 

 pedicels 4-6 dm. long, rayless, flowers ochroleucous: akenes quad- 

 rangular, glabrous except near the top, slighdy attenuate at the 

 apex, arcuate; awns usually 4, 4-5 mm. long, one nearly erect, three 



20-2 



long: bracts of the outer involucre linear-lanceolate 8-10 mm. long, 

 twice the length of the inner linear pointed ones. 



At first sight this Bidens with large heads and spreading, strongly 

 curved akenes appears to be a monstrosity. The central akene is 

 sometimes nearly straight, but it has always the three refracted awns 

 of the outer curved ones. The bent awns evidently fill the office of 

 the barbs in the ordinary species, for in this plant they are very soft 

 and small. The fruiting head contains 15-20 akenes. 



In the Genera Plantarum of Bentham and Hooker, onlv fourteen 

 genera, five of them monotypic, are included in the subtribe Taget- 

 meae, and the following are reduced either by them or their prede- 

 cessors o synonyms. Wmenozva Cav. Schlechlendalia Willd. 



ffT^'pi ^f''''^^^^'- Oomenocoma C^ss. ComacUnium 

 Scheid. & Planch. Aciphyllea Gray. Gnaphalopsis DC. Low- 



^t//J^."^'n? ;fr ^""- ^^^''^-^ Cass. ir.././^a Cass. 

 ill fl!^?' ^^^^^^"'^ Cass. Cryptopctalon C..S. Lorentca 



ni?;.H 'r r"'-' ""^' ^'- ^'^y has since excluded Clap- 



a k In".^ "" f" 'P'"'^ '° ""y'^^'^ -d relegating the other 



Thvmonh r . " """'^' "^ J^"'"-- "^ has alfo reduced, 

 Thymophyllum to a synonym of Hymenatherum. Adenophyllum 



f 



