ANTENNAKIA COMPOSITE 327 



29 ANTENNAiMA Gsertn. Fruct. & Bern, ii, 410, t. 167. 



Dioecious or polygamo-dicecious perennial herbs with alternate 

 leaves and many-flowered heads of inconspicuous flowers. Heads 

 discoid ; the pistillate flowers with filiform truncate corolla shor- 

 ter than the 2- cleft style ; staminate with, tubular 5-lobed corolla 

 and style with undivided truncate apex, involucre of imbrica- 

 ted, scarious, persistent bracts, at least their tips white or colored. 

 Receptacle flat or convex, naked. Achenes small, nearly terete 

 or flattish, mostly glabrous. Pappus a single series of capillary 

 bristles, those of the fertile flowers very slender, connate at base, 

 and so falling'from the achene in a body ; those of the sterile of- 

 ten crisp, mostly thickened at the apex. 



§ 1 Bristles of the pappus of the staminate flowers hardly at 

 all thickened, but minutely barbellate near the apex: achenes 

 obscurely 2-3 nerved, pubescent, the short hairs with 2-lobed 

 and at length biuncinate tips. Bracts of the campanulate or 

 somewhat turbinate involucre brownish. 



A. dimorpha T. & G. Fl. ii, 431. Depressed cespitose, forming dense 

 matted tufts from a few inches to a foot ar more in diameter and onl^ an 

 inch or two high: the thickish rootstocks creeping: stems 1-2 inches high, 

 very leafy : leaves spatalate attenuate helow to a petiole, 6-12 lines long 

 whitish-tomentose both sides : heads solitary, 3-4 lines high : bracts of the 

 involucre well imbricated, the outer successively shorter and obtuse, the 

 inner acute or acuminate ; of the fertile heads narrow with hyaline acum- 

 inate tips : achenes oblong, pubescent : pappus of the fertile flowers copi- 

 ous, of soft and very slender bristles that are not at all thickened upward. 

 Common on dry plains east of the Cascade Mountains, Brit. Columbia to 

 California and the Eocky Mountains. 



A.'flageliaris Gray Proc. Am. Acad, xvii, 212. Silky-lanate : stem sol- 

 itary, 6-20 lines high, from a slender rootstock: lower leaves subulate 

 from a very broad and somewhat clasping base, producing from their axils 

 slender wiry stclons 2-6 inches long, with a tuft of leaves and a, bud at 

 their apices which root and form new plants : cauline leaves linear, 10-14 

 lines long, not at all narrowed at base : heads solitary, 3-4 lines high : 

 bracts of the involucre in few ranks, but little unequal, acute or the inner 

 ones shortly acuminate. On barren rocky ridges in the mountains of eas- 

 tern Oregon and Washington. 



A. steno^hylla Gray 1. c "Stems erect from a subterranean caadex, 

 slender, 4-6 inches high, without stolons, leafy, terminated by a capituli- 

 from glomerule of 2-4 heads : leaves very narrowly linear or almost filiform, 

 attenuate to both ends (the larger 3 inches long), silvery- woolly: heads 

 barely 3 lines long : involcural bracts in both sexes broadish and obtuse, 

 dark brown or in the male the inner ones with white tips : achenes (two 

 /thirds of a line long), minutely hirtellous-scabrous : female pappus scanty, 

 only a line long : * * High hills Union Co. eastern Orogon Cusick." 



§ 2 Bristles of the staminate pappus stout, with clavate or 

 Bcarious-dilated tips. 



* Not surculoee by stolons, 6-12 inches high : pistillate heads nar- 

 row, cylindraceous or clavate : achenes glandular. 



A. Geyeri Gray PI. Fendl. 107.. Pubescence appressed silky.-canescent: 

 stems numerous from a lignescent branched base, 3-8 inches high : leaves 



