COMPOSITE. (COMPOSITE FAMILY.) 241 



62. ACTINOSPERMITM, 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 

 l-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. Chaff of the convex or conical receptacle narrow-linear, rigid. 

 Achenia oblong, narrowed downward, 5-angled, mostly hairy. Pappus of 5 - 6 

 ovate or triangular acuminate entire membranaceous scales. Perennial herbs, 

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

 leaves, and a solitary head of white or purplish 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. lanceolata, Pursh. Stem naked above, simple, pubescent ; leaves 

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

 obtuse ; achenia pubescent. Var. PLATYPHYLLA, 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 branched, 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 haiiy 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 pinnately divided. Heads 

 solitary, terminal. Rays white. 



1. M. Cotula, DC. Stem 1 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 



