WOOTOJST AND STANDLEY FLORA OF NEW MEXICO. 641 



Tribe V. HELIANTHEAE. 



Involucral bracts (uniserial) partly or wholly inclosing the achenes of the ray flowers; 

 pappus none in the ray achenes. 

 Rays inconspicuous, scarcely exserted; plants viscid; achenes laterally com- 

 pressed 51. Madia (p. 697). 



Rays showy; plants not viscid; achenes not laterally compressed. 



52. Blepharipappus (p. 698). 

 Involucral bracts not inclosing the ray achenes; pappus various. 

 Disk flowers sterile. 



Involucres cylindric or fusiform, few-flowered. 

 Leaves, at least some of them, connate, simple; achenes oblong, without diver- 

 gent awns or horns 53. Guardiola (p. 698 1. 



Leaves never connate, dissected into linear-filiform segments; most of the 

 achenes bearing a pair of divergent awns or horns. 



54. Dicranocarpus (p. 698). 

 Involucres campanulate or hemispheric, many-flowered. 

 Rays white. 



Rays long and showy; leaves entire 55. Melampodium (p. 698). 



Rays scarcely if at all exceeding the disk; leaves lobed or pinnatifid. 



56. Parthenium (p. 699). 

 Rays yellow. 

 Achenes strongly flattened, unicostate on the inner face; pappus nearly 

 obsolete or else evanescent; plants finely canescent. 



57. Berlandiera (p. 699). 

 Achenes carinate on both surfaces; pappus conspicuous, persistent; plants 



rough-hirsute 58. Engelmanxia (p. 700). 



Disk flowers fertile. 

 Rays persistent on the achenes and becoming papery. 



Annuals; rays short and inconspicuous, greenish white; leaves petiolate, en- 

 tire 59. Saxvitai.ia (p. 700). 



Perennials; rays showy, white or yellow; leaves mostly sessile, sometimes 

 toothed . 

 Disk achenes compressed; leaves entire; plants low, less than 20 cm. high. 



60. Crassixa (p. 700). 

 Disk achenes obtusely 4-angled; leaves toothed; plants tall, usually 50 cm. 



high or more 61. Heliopsis (p. 701V 



Rays deciduous, thin, or wanting. 

 Pappus of several to many hyaline palese (rarely wanting). 



Rays while; heads very small; leaves opposite 62. Galinsoga (p. 701). 



Rays yellow or brown; heads large; leaves alternate. 



97. Gaillardia (p. 719). 

 Pappus various but never of conspicuous hyaline scales. 

 Achenes obcompreased ; involucre of 2 distract series. 

 Rays pink; achenes slender, beaked; slender annual. 



63. Cosmos i]>. 701). 



Rays yellow, rarely wanting; achenes various/, annuals or perennials. 

 Bracts of inner involucre united at least to the middle. 



(II. Tin 11 3M i:m \ p. '.<!-' I. 



I'.rac i j distinct or aearlj 

 Achenes qoI awned; pappus obscure or wanting; rays neutral. 



65. I "i,i ofsis p. 703). 

 176° 15 41 



