204 
samic-scented, from a woody perennial root: stem-leaves all narrowly linear, small, 
attenuate-acute, commonly erect, hardly broader at the short-decurrent base, viscid- 
glandular above: involucre much-imbricated, pure pearly white, the bracts thin- 
papery.—Dry water courses, extreme western Texas. 
39. POLYMNIA L. (LEAF-CUP.) 
Tall branching viscid-hairy perennial herbs (exhaling a heavy odor), 
with large thin opposite (or uppermost alternate) lobed leaves with 
dilated stipular-like appendages at base, broad many-flowered radiate 
heads in panicled corywbs, pistillate rays and perfect but sterile disk- 
flowers, involucral bracts in 2 rows (the outer about 5, leaf-like, large 
and spreading; the inner small and membranaceous, partly embracing 
the thick triangular-obovoid achenes), flat membranous-chaffy recep- 
tacle, and no pappus. 
1. P. Uvedalia L. Roughish-hairy, stout, 12 to30 dm, high: leaves broadly ovate, 
angled and toothed, nearly sessile; the lower palmately lobed, abruptly narrowed 
into a winged petiole: outer involucral bracts very large: rays 10 to 15, linear- 
oblong, much longer than the inner involucral bracts, yellow: achenes strongly 
striate.—Fertile or moist ground, extending from the Atlantic States into Texas. 
40. MELAMPODIUM L. 
Branching herbs, with opposite mostly sessile leaves, pedunculate 
heads terminating the branches or in the forks, short or conspicuous 
fertile rays, perfect but sterile disk-flowers, a double strongly dimor- 
phous involucre (exterior of 4 or 5 leafy plane bracts; interior of a single 
series of small bracts which completely and permanently inclose the 
obovate more or less compressed and incurved smooth and glabrous 
achenes with a pericarp-like indurated accessory covering), convex or 
conical chaffy receptacle, and no pappus. 
1. M. cinereum DC. Branched from the base, cinereous or even silvery canes- 
cent with a fine and mostly close pubescence, or greener and becoming strigulose: 
leaves linear or the lower lanceolate or spatulate, entire or undulate or even sinuate- 
pinnatifid: ligules 5 to 9, cuneate-oblong, 2 or 3-lobed at apex, conspicuously ex- 
serted, white: fructiferous bracts nearly terete, somewhat incurved, muricate with 
sharp tubercles, the truncate and usually even margin of its hood commonly in- 
curved.—Open ground throughout Texas. Var, RAMOSISSIMUM Gray (M. ramosissi- 
mum DC.) is more loosely pubescent, with mostly smaller heads, and the hood of the 
fructiferous bracts with less thickened margin little or not at all involute, sometimes 
erose or denticulate and bearing a mucro or short cusp.—Southern borders of Texas, 
41. DICRANOCARPUS Gray. 
Branching nearly glabrous annual, with opposite ternately divided 
leaves, 3 or 4 narrow involucral bracts, 3 or 4 fertile ray-flowers with 
very small ligules, 3 or 4 perfect but sterile disk-flowers, flat and scari- 
ous-chaffy receptacle, and dimorphous achenes (1 or 2 elongated to 
twice or thrice the length of the involucre, subulate to oblong-linear, 
nearly smooth, puberulent, long-persistent, tipped with 2 divaricate 
