* * 



COMPOSITJg (composite FAMILY.) 431 



Ahenes 4:-angled, moi'e or less Jiattened, the marginal angles acute. 

 Chaff heeled^ inserted over the whole receptacle. 



t Perennials or biennials. 



1 A. tinctoria. 

 t t Annuals. 



X Receptacle hemispherical — Tail species. 



2 A. altissima, 3 Paliestina, 4 coelopoda. 

 X X Receptacle conical. Dwarf species. 



5 A. lyonettoides. 



Alcenes obconical-iurbinate, often angled, the outer sometimes pyramidal 

 but not flattened. Chaff lanceolate-linear to ovate-oblong, inserted over the 

 ichole recepjtacle. 



t Perennials. Rays lohite or 0. 



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



1 1 Annuals. 

 X Corolla-tube glabrous. 

 § Ahenes rounded at tip. 



10 A. microsperma. 



§ § Alcenes truncate, bald or surmounted by a loro crown. 



^ Outer scales of iwDolucre triangular or lanceolate, acute. Rays fertile, 



white. 



11 A. Philistsea, 13 leucanthemifolia, 13 deserti. 



IT IT Outer scales of involucre obtuse, scarious. 



14 A. Rasheyana, 15 hyalina. 



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

 long as they. 



16 A. melampodina, 17 Haussknechtii, 18 Chia. 



X X Corolla tube hairy at base. 



19 A. scariosa, 20 cornucopige, 31 Hebronica, 33 Damascena, 



* * * Chaff" subulate or lanceolate-linear, inserted only at top of receptacle 

 (^except in A. Kahirica). 



t Rays sterile, 

 38 A. Cotula. 



1 1 Rays pistillate. 



34 A. KaMrica, 25 pseudocotula, 26 rotata, 37 Tripolitana. 



1. A. tinctoria, L. 71 Yellow Chamomile. .4 to .8 ; stems 

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

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

 lanceolate, 2iQ,\]iiG, pectinate, mucronate lobules. Heads .03 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. 



