19. BÉLLIS, Tourn. Daisy.
Heads many-flowered, radiate; the rays numerous, pistillate. Scales of the involucre herbaceous, equal, in about 2 rows. Receptacle conical, naked. Achenes obovate, flattened, wingless, and without any pappus.—Low herbs (all but our single species natives of the Old World), either stemless, like the true Daisy, B. perennis (which is found as an occasional escape from cultivation), or leafy-stemmed, as is the following. (The Latin name, from bellus, pretty.)
1. B. integrifòlia, Michx. (Western Daisy.) Annual or biennial, diffusely branched (4´–1° high), smoothish; leaves lanceolate or oblong, the lower spatulate-obovate; heads on slender peduncles; rays pale violet-purple.—Prairies and banks, Ky. and southwestward. March–June.
20. APHANÓSTEPHUS, DC.
Involucral scales in few series, broadly lanceolate, the outer shorter. Achenes prismatic, the broad truncate apex bearing a short coroniform pappus. Otherwise as Bellis.—Southwestern leafy-stemmed and branching pubescent herbs, with solitary terminal daisy-like heads. (Ἀφανής, inconspicuous, and στέφος, crown; in allusion to the pappus.)
1. A. Arkansànus, Gray. Diffuse, 1° high; leaves oblong-spatulate to broadly lanceolate, the lower often toothed or lobed; rays white to purple, ½´ long; pappus mostly 4–5-lobed.—Plains of Kan. and southward.
21. CHÆTOPÁPPA, DC.
Heads several-flowered, radiate; disk-flowers often sterile. Involucral bracts imbricated in 2 or more rows, the outer shorter. Receptacle flat, naked. Achenes fusiform or compressed; pappus of 5 or fewer thin nerveless paleæ, alternating with rough bristly awns, or these wanting.—Low southwestern branching annuals, with narrow entire leaves and solitary terminal heads; ray white or purple. (Χαίτη, a bristle, and πάππος, pappus.)
1. C. asteroìdes, DC. Slender, 2–10´ high, pubescent; involucres narrow, 2´´ long; rays 5–12; achenes pubescent.—Dry grounds, Vernon Co., Mo., and southward.
22. BOLTÒNIA, L'Her.