BLEPHARIPAPPUS COMPOSIT A 345 
wanting ), each subtended by a bract of the usually uniserial involu- 
lucre which partly or completely encloses its achene. Disk-flowers 
hermaphrodite, but mostly some or all of them sterile. Receptacle 
chaffy throughout or of only a more or less united ring between the 
ray- and disk-flowers. 
* Scales of the receptacle distinct, chaffy-membranaceous or scari- 
‘ous, mostly deciduous with the fruit. Bracts of the involucre merely 
concave. | 
46 BLEPHARIPAPPUS Hook. FI. i, 316 in Part. 
Low corymbosely or paniculately branched annuals with nar- 
row alternate leaves and rather small heads of white or purplish 
flowers. Heads heterogamous, with 3-6 pistillate broad-cuneiform 
3-lobed ray- and 6-12 perfect 5-toothed disk-flowers, or some of 
the central ones sterile. Bracts of the involucre nearly in a sin- 
gle series, nearly flat and almost equal. Receptacle convex, 
chaffy throughout, the chaff thin and membranaceousg, deciduous 
with the fruit. Style in the disk-flowers long, thickened upward, 
hairy, 2-cleft only at the apex; the branches obtuse and not ap- 
pendaged, or in the central sterile ones nearly entire. Achenes 
turbinate, silky-villous. Pappus of 10-12 linear or aristiform 
_ paleze with hyaline margins which are mostly lacerate-fimbriate 
so as to appear plumose. | 
B. seaber Hook. |. c. Puberulent and scabrous, and with some hispid 
hairs above: stems stoutish, 4-12 inches high, loosely branched: leaves 
linear, sessile. 144-2 inches long with entire revolute or involute margins: 
heads short-peduncled, terminating the paniculate branches: bracts of the 
involucre lanceolate, acute, 4-4 lines long, more or less hirsute: rays much 
exceeding the inyolucre, deeply 3-lobed, always inrolling and becoming 
inconspicuous when the sun shines on them: anthers brownish-purple. 
Dry plains and mountains, Brit. Columbia to California and Idaho, east: 
of the Cascade Mountains. 
B. levis Gray Bot. Gaz. xiii, 73. Stems slender, 6-12 inches high, 
smooth, branched: leaves linear, 2-10 lines long, sessile, the lower ones 
spreading, those of the branches closely appressed: heads small, termina- 
ting the filiform branchlets: bracts of the involucre linear-lanceolate, 2-3 
lines long, scabrous: rays 3-4 lines long, not closing in sunshine, deeply 
3-lobed, often with dark-purple veins. On dry plains aud hill-sides, 
southern Oregon to California. - 
* * Scales of the receptacle always present between the ray- and 
disk-flowers, usually more or less united intoacup. Bracts of the 
involucre conduplicate-infolded and embracing the laterally com- 
pressed achenes. 
47 ANISOCARPHUS Nutt. Trans. Am. Phil. Soc. vii, 388. 
Villous-hirsute perennial herbs with linear to lanceolate entire 
or denticulate sessile leaves and numerous paniculate or corym- 
bose heads of flowers with yellow rays that do not close in sun- 
shine. Heads many-flowered; the ray-flowers abont 12, ligulate, 
pistillate, those of the disk tubular, staminate and pistillate but 
