Leptosyne. composite. 355 



somewhat membranaceous. Receptacle convex; the chaff membranaceous, 

 3-nerved, deciduous with the fruit. Rays oblong, coarsely 3-toothed, the 

 base abruptly narrowed into a short slender tube, which is sparsely barbellate 

 at the summit. Corolla of the disk with a slender tube, which is furnished 

 with a bearded ring at the summit, and an obconical throat, deeply 5-toothed. 

 Anthers pale. Branches of the style in the ray-flowers scarcely exserted, 

 obtuse ; in the disk somewhat capitellate at the apex, and terminated by a 

 very short and abrupt pointed cone. Achenia oval, obcorapressed, slightly 

 incurved when mature, sparsely scabrous with short capitate gland-like 

 hairs, surrounded by a narrow, at length somewhat fungous-thickened wing- 

 like margin, 1-nerved on the inside, crowned with a minute and entire coro- 

 niform or cup-shaped pappus. — An annual (biennial, Nutt.) glabrous very 

 slender herb, branching from the base; the scapes or peduncles (8-12 inches 

 long) naked, bearing a single head. Leaves alternate, nearly all at the base 

 of the stem, linear-filiform, entire, or sparingly iiinnately parted. Ray and 

 disk yellow. 



L. Douglasii (DC ! 1. c.) — Hook. SfArn.! hot. Beechey, suppl. p. 352. 

 L. Californica, Nutt.! in trans. Aiuer. phil. soc. {n. ser.) 7. p. 363. 



California, Douglas ! (in flower only) Nuttall ! May-June. — Head, in- 

 cluding the rays, three-fourths of an inch in diameter. — Instead of having the 

 disk-flowers sterile, as described from immature specimens by De CandoUe, 

 and Hooker & Arnott, these alone ripen their fruit according to Nuttall ; but 

 we find perfect achenia both in the disk and ray. We place the genus as 

 near as possible to Coreopsis, and next to Chrysanthellum in Verbesinese. 



106. TUCKERMANNIA. Nutt. in trans. Amer. phil. soc. I. c. 



Head many-flowered; the ray-flowers 15-20, ligulate; those of the disk 

 tubular, perfect. Involucre double ; the scales ovate or oval, all slightly 

 united at the base ; the exterior 6-8, shorter than the disk, herbaceous; the 

 interior 8-10, membranaceous, somewhat colored (yellowish). Receptacle 

 flat ; the chafT membranaceous and scarious, minutely nerved, linear-lanceo- 

 late, flat, apparently deciduous. Corolla of the disk with a slender tube, 

 which at the summit is furnished with a naked or obscurely barbellate ring (as 

 in Leptosyne, except that the jointed hairs are few and short or nearly want- 

 ing) ; the throat narrowly obconical, 5-toothed. Branches of the style in the 

 disk-flowers slender, somewhat capitellate at the apex, and terminated by an 

 obscure or extremely short cone. Achenia ellijitical, obcompressed, smooth, 

 surrounded by a narrow wing or margin, entirely destitute of pappus. — A 

 somewhat succulent perennial glabrous herb ; the alternate or scattered 

 bipinnately-divided leaves with linear entire segments, nearly all borne to- 

 wards the base of the stem ; which terminates in a naked peduncle (a foot 

 long), bearing a very showy head, more than two inches (or even 3-4 inches, 

 ex Nutt.) in diameter. Flowers golden yellow. 



T. maritima (Nutt. ! 1. c.) 



St. Diego, California, on shelving rocks near the sea, Nuttall ! May. — 



