COMPOSITE. (composite FAMILY.) 241 



62. ACTINOSPERMUM, Ell. 



Scales of the involucre in about 2 rows, lanceolate, setaceously acuminate. 

 Margins of the cells of the receptacle cuspidate-toothed. Achenia radiate at the 

 summit. Pappus a row of 12 short roundish entire scales. Otherwise like Bald- 

 winia. — A slender branching annual. Leaves alternate, linear, fleshy. Heads 

 of yellow flowers showy, terminating the peduncle-like summit of the branches. 



1. A. angustifolium, Torr. & Gray. (Baldwinia multiflora, Nutt.) — 

 Dry sandy ridges in the pine barrens, Florida and Georgia. Sept. — Stem 

 I°-2° high, smooth. Leaves very numerous, sprinkled with jointed hairs. 



63. MARSHALLIA, Schreb. 



Heads many-flowered ; the flowers all tubular and perfect. Corolla pubescent, 

 with linear spreading lobes. Scales of the involucre oblong-linear or lanceolate, 

 in 1-2 rows. Chaflf of the convex or conical receptacle narrow-linear, rigid. 

 Achenia oblong, narrowed downward, 5-angled, mostly hairy. Papi)us of 5-6 

 ovate or triangular acuminate entire mend)ranaceous scales. — Perennial herbs, 

 with simple and scape-like or branching stems, smooth entire 3-nerved alternate 

 leaves, and a solitary head of white or pixrplish flowers terminating the stem or 

 branches. Anthers blue. 



1. M. latifolia, Pursh. Stem leafy, simple or sparingly branched above ; 

 leaves ovate-lanceolate, acuminate ; scales of the involucre linear-lanceolate, 

 acute; achenia smooth. — Dry soil, in the upper districts. May and June. — 

 Stem 1° high. 



2. M. lauceolata, Pursh. Stem naked above, simple, pubescent; leaves 

 lanceolate, obtuse ; the lowest spatulate ; scales of the involucre oblong-linear, 

 obtuse; achenia pubescent. — Var. plat yphylla, Curtis. Stem leafy to the 

 middle; leaves longer and broader; the lowest (5' -6') on long and slender 

 petioles. — Dry open woods, Florida to North Carolina, and westward; the 

 variety in the upper districts. April -June. — Stem 6' - 12' high. Leaves 

 2' -3' long. 



3. M. angUStifolia, Pursh. Stem simple or branclicd, leafy below, pu- 

 berulent above ; leaves linear, acute, the lowest spatulate ; scales of the involu- 

 cre linear and acute ; disk at length ovate or oblong ; achenia with hairy angles. 

 — Low pine barrens, Florida to North Carolina. July and Aug. — Stem 2° - 3° 

 high. 



64. MARUTA, Cass. May-weed. 



Heads many-flowered ; the rays neutral. Scales of the hemispherical involu- 

 cre imbricated in few rows, shorter than the disk. Receptacle conical, chaffy- 

 throughout, or only at the summit. Achenia obovoid, ribbed, smooth. Pappus 

 none. — Branching annuals. Leaves alternate, thrice pinnatcly divided. Heads 

 solitary, terminal. Rays white. 



1. M. Cotula, DC. Stem l°high; divisions of the leaves linear; scales 

 of the involucre with scarious margins ; disk yellow. (Anthemis Cotula, L.) — 

 Waste places. Introduced. May and June. 

 21 



