Riddellia. COMPOSITE. 317 



Tribe VI. HELENIOIDEiE, p. 70. 



128. CLAPPIA, Gray. (Dr. A. Clapp, author of a Synopsis of the 

 Medicinal Plants of the U. S.) — Bot. Mex. Bound. 93; Benth. & Hook. Gen. 

 ii. 413, & Ic. PL xi., partly. (The excluded 0. aurantiaca, Benth. Ic. PL 1. 1104, 

 is a Dysodia, apparently wanting the oil-glands.) — Single species. 



C. SUSedaefolia, Gray, 1. c. Suffruticose, a foot high, widely branching, not punctate nor 

 glandular : leaves alternate, fleshy, terete, linear, entire, or the lower pinnately 3-5-parted, 

 sessile : head (half-inch in diameter) pedunculate, terminating herbaceous branchlets : flow- 

 ers doubtless yellow. — Benth. Ic. PL t. 1105. — S. Texas; on the Rio Grande at Laredo, 

 Berlandier. Alkaline flats of the Pecos, Havard. 



129. JAtTMEA, Pers. (I. H. Jaume St. Hilaire, a French botanist.) — 

 Herbs or suffruticose plants (mainly S. American) ; with opposite entire leaves, 

 and terminal pedunculate heads of yellow flowers. — Syn. PL ii. 397 ; Benth. 

 & Hook. Gen. ii. 397 (including Coinogyne, Less., Uspejo'a, DC, Qhathymenia, 

 Hook. & Arn., &c.) ; Gray, Bot. Calif, ii. 371. Kleinia, Juss., not L. 



J. carnosa, Gray. Procumbent or ascending perennial herb, fleshy, glabrous, leafy to the 

 short-pedunculate head : leaves spatulate-linear, almost terete, about inch long : head half- 

 inch long, fleshy : rays 6 to 10, linear, not surpassing the disk : receptacle conical : akenes 

 glabrous, destitute of pappus. — Wilkes Exped. xvii. 360, & Bot. Calif, i. 372. Coinogyne 

 carnosa, Less, in Linn. vi. 520; Torr. & Gray, Fl. ii. 410. — Salt marshes and sea-beaches, 

 Brit. Columbia to California; probably first coll. by Chamisso. 



130. VENEGASIA, DC. (Michael Venegas, a Jesuit missionary, early 

 writer upon California.) — Prodr. v. 43 ; Benth. & Hook. Gen. ii. 397. — Single 

 species, yellow-flowered. 



V. carpesioides, DC. 1. c. Large perennial herb, with glabrous leafy branches : leaves 

 alternate, slender-petioled, membranaceous, ovate and subcordate, mostly denticulate, veiny, 

 somewhat puberulent or atomiferous : heads terminal and from upper axils, short-peduncled, 

 inch broad, and the about 15 rays an inch long. — Gray, Bot. Calif, i. 372. Parthtmiopsis 

 maritima, Kellogg, Proc. Calif. Acad. v. 100. — Rocky banks of streams, coast of California, 

 from Santa Barbara southward ; first coll. by Douglas and Coulter : fl. summer. 



131. RIDDELLIA, Nutt. (Prof. John L. Riddell, author of a Synopsis 

 of the Flora of "Western States.) — Low and corymbosely branched woolly herbs 

 (Texano-Arizonian) ; with alternate and spatulate or linear leaves, the cauline 

 entire, and small heads of yellow flowers ; the ligules large in proportion, becom- 

 ing pale or whitish in age and thin-papery ; fl. summer. In habit not unlike 

 Zinnia § Diplothrix of the same regions. Bracts of the involucre distinct, but 

 connivent-erect, and connected by the intricate wool so as to seem connate. — 

 Trans. Am. Phil. Soc. n. ser. vii. 371 ; Gray, PL Fendl. 94, & Bot. Calif, i. 372. 

 Psihstrophe, DC. Prodr. vii. 261. 



# Rays at maturity half-inch long: akenes and pappus glabrous, or the former with few and short 

 scattered hairs: perennial. 

 R. tagetina, Nutt. 1. c. Loosely or somewhat villosely lanate, sometimes glabrate in age, 

 rather widely branched : radical and even lower cauline leaves often laciniate-pinnatifid : heads 

 numerous, mostly cymosely clustered and short-peduncled: palea3 of the pappus oblong- 

 lanceolate, entire, usually obtuse, half or three-fourths the length of the disk-corolla. — Torr. 

 in Emory Rep. t. 5; Gray, PI. Fendl. 94. — W.Texas to E. Colorado and Arizona; first 

 coll. by Janes. 



