COMPOSITES (composite FAMILY.) 431 



* Akenes A-angled, more or less jlattened, the marginal angles acute. 

 Gliaff Iceelecl, inserted over the whole receptacle. 



t Perennials or biennials. 



I A. tinctoria. 



1 1 Annuals. 

 \ Receptacle hemispherical — Tall species. 

 3 A. altissima, 3 Paliestina, 4 coelopoda. 



I I Receptacle conical. Dwarf species. 



5 A. lyonettoides. 



* * ATcenes ohconical-turbinate^ often angled, the outer sometimes i^yramidal 

 but not flattened. Chaff lanceolate-linear to ovate-odlong, hiserted over the 



whole receptacle. 



t Perennials. Rays white or 0. 



6 A. Cassia, 7 montana, 8 Blancheana, 9 pauciloba. 



1 1 Annuals. 

 X Corolla-tute glabrous. 

 § Akenes rounded at tip. 

 10 A. microsperma. 



§ § ATcenes truncate, bald or surmounted by a low crown. 



IT Outer scales of involucre triangular or lanceolate, acute. Rays fertile, 



white. 



II A. Philistaea, 12 leucanthemifolia, 13 deserti. 



IT IT Outer scales of involucre obtuse, scarious. 



14 A. Rasheyana, 15 hyalina. 



§ § § Ahenes with an auricle at their inner angle as long or half as 

 long as they. 



16 A. melampodina, 17 Haussknechtii,. 18 Chia. 



\ X Corolla tube hairy at base. 



19 A. scariosa, 20 cornucopise, 21 Hebronica, 22 Damascena, 



* * * Gha-ff subulate w lanceolate-linear, inserted only at top of receptacle 



{except in A. Kahirica). 



t Rays sterile, 



23 A. Cotula. 



1 1 Rays pistillate. 



24 A. Kahirica, 25 pseudocotula, 26 rotata, 27 Tripolitana. 



1. A. tinctoria, L. % Yellow Chamomile. .4 to .8 ; stems 

 numerous, wand-like, stiff, simple or branching. Leaves appressed- 

 hirsute, canescent, oblong in outline, bipinnatisect into triangular- 

 lanceolate, Sicwie, pectinate, mucronate lobules. Heads .02 to .03 broad, 

 long-peduncled ; outer scales of involucre lanceolate, acutish, inner 

 oblong-linear, scarious at the obtuse tip ; rays yellow, shorter than in- 

 volucre ; chaff abruptly tapering to a sharp cusp ; akenes many- 

 grooved on each side, with a short crown — Spring and summer — 

 Dry places ; Cassius and Amanus, and northward. 



