WOOTON 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 .... 2.20... eee eee ee eee ee cee eee ee cece e eee eeee 51. Manta (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...... cence cee eee ee eee ee eeee 53. GUARDIOLA (p. 698). 
Leaves never connate, dissected into linear-filiform segments; most of the 
achenes bearing a pair of divergent awns or horns. 
54. DicRANOcCARPUS (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.............2-000--eeeee ee eeee 58. ENGELMANNIA (p. 700). 
Disk flowers fertile. 
Rays persistent on the achenes and becoming papery. 
Annuals; rays short and inconspicuous, greenish white; leaves petiolate, en- 
tire... 2.22... eee eee eee eee eee eee eee ee eee 59. Sanviraia (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. Crassina (p. 700). 
Disk achenes obtusely 4-angled; leaves toothed; plants tall, usually 50 cm. 
high or more... 2... 0... eee cece ce eee ...-61. Hetiopsis (p. 701). 
Rays deciduous, thin, or wanting. 
Pappus of several to many hyaline palez (rarely wanting). 
Rays white; 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 obcompressed; involucre of 2 distinct series. 
Rays pink; achenes slender, beaked; slender annual. 
63. Cosmos (p. 701). 
Rays yellow, rarely wanting; achenes various; annuals or perennials. 
Bracts of inner involucre united at least to the middle. 
64, THELESPERMA (p. 702). 
Bracts distinct or nearly so. . 
Achenes not awned; pappus obscure or wanting; rays neutral. 
65. Coreopsis (p. 703). 
52576 °—15——-41 
