262 COMPOSITiE. (COSIPOSITE FAMILY.) 



apex. — Ponds and slow deep streams, Massachusetts (rare) to Illinois and 

 northward. Aug. - Oct. 



6. B. bipinn^ta, L. (Spanish Needles.) Smooth annual, branched ; 

 leaves 1- 3-pinnatehj parted, petioled ; leaflets ovate-lanceolate, mostly wedge-shaped 

 at the base ; heads small, on slender peduncles ; outer involucre of linear scales 

 equalling the short pale yellow rays ; achenia slender, 4-grooved and angled, nearly 

 smooth, 3 - 4-awned. — Dry soil, Connecticut to Illinois and southward. 



43. VERBESINA, L. Ceowneeard. 



Heads several - many-flowered ; the rays pistillate, few, or sometimes none. 

 Scales of the erect jn-v'olucre few, imbricated in 2 or more rows. Receptacle 

 rather convex; the chaff concave. Achenia flat (compressed laterally), winged 

 or wingless, 2-awned. — Perennial herbs ; the toothed or lobed leaves decurrent 

 on the stem. ("Name metamorphosed from Verbena.") 



1. v. Sieg6Sb6ckia, Michx. Stem tall, 4-wingcd ; leaves opposite, ovate, 

 triple-nerved, serrate, pointed at both ends, often pubescent beneath (large and 

 thin); heads in compound coiymbs ; flowers yellow; rays 1-5, lanceolate; 

 achenia wingless. — Rich soil, S. Penn. to Illinois, and southward. July. 



2. "V. Virginica, L. Stem narrowly or interruptedly winged, downy- 

 pubescent, like the lower surface of the ovate-lanceolate feather-veined alternate 

 leaves ; heads in compound corymbs ; flowers white ; rays 3-4, oval ; achenia 

 narrowly winged. — Dry soil, Pennsylvania 'i Illinois, and southward. Aug. 



44. DYSODIA, Cav. Petid Marigold. 



Heads many-flowered, usually radiate ; the rays pistillate. Involucre of one 

 row of scales united into a firm cup, at the base some loose bractlcts. Recep- 

 tacle flat, not chaffy, but beset with short chaiFy bristles. Achenia slender, 4- 

 angled. Pappus a row of chaffy scales dissected into numerous rough bristles. 

 — Herbs, mostly annuals or biennials, dotted with large pellucid glands, which 

 give a strong odor (as in TAGixES, the French Marigold of the gardens, 

 which belongs to the same group) ; the heads terminating the branches ; flow- 

 ers j-ellow. (Name Svcra>8ia, an ill smell, which the plants exemplify.) 



I. D. ehrysanthemoides. Lag. Nearly smooth, diff"usely branched 

 (6'- 18' high); leaves opposite, pinnately parted, the narrow lobes bristly- 

 toothed or cut ; rays few, scarcely exceeding the involucre. — Roadsides, and 

 banks of rivers, from Illinois southward : a common weed ; now migrating east- 

 ward, established at Buffalo, N. Y., G. W.' Clinton. Aug. - Oct. 



45. HYMENOPAPPTJS, L'Her. Htmenopappus. 



Heads many-flowered ; the flowers all tubular and perfect. Scales of the in- 

 volucre 6-12, loose and broad, thin, the upper part petal-like (usually white). 

 Receptacle small, naked. Corolla with large revolute lobes. Achenia top- 

 shaped, with a slender base, striate. Pappus of 15-20 small and blunt scales 

 in a single row, very thin (whence the name of the genus, from viifjv, membrane, 

 and Trainrvs, pappus). — Biennial or perennial herbs, with alternate mostly dis- 

 sected leaves, and corymbed small heads of usually whitish flowers. 



