372 COMPOSITE. Jaumea. 



1. J. carnosa, Gray. Steins procumbent or ascending, herbaceous : leaves 

 linear or spatulate-linear, very fleshy, somewhat terete when fresh : head erect on a 

 short peduncle : rays 6 to 10, linear, small : receptacle highly conical, smooth and 

 fleshy : akeues wholly glabrous, destitute of pappus. Bot. "Wilkes Exp. 3GO. 

 Coinoyyne carnosa, Less. ; Torr. & Gray, Fl. ii. 410. 



Salt marshes along the coast, from San Diego to San Francisco, and to Puget Sound. Its 

 near relative inhabits the eastern shore of extra-tropical South America, and has a pappus, 

 but no rays. 



62. VENEGASIA, DC. 



Head many-flowered, with numerous pistillate rays ; the flowers all fertile. In- 

 volucre very broad, imbricated in several ranks ; scales round-ovate ; the outermost 

 somewhat foliaceous, the inner successively more membranaceous and a little colored, 

 a few of the innermost smaller, narrow and scarious. Receptacle flat, naked. Tube 

 of the corollas glandular-bearded, especially at base : rays elongated, entire or 2 - 3- 

 toothed at the narrow apex : disk-corollas elongated-cylindrical. Style-branches 

 of the disk-flowers very obtuse. Akenes oblong-linear, many-nerved, somewhat 

 5-angled, destitute of pappus. A stout herb, with alternate cordate petioled leaves, 

 and rather large heads of yellow flowers. 



1. V. carpesioides, DC. Several feet high, with pithy and nearly glabrous 

 branches, leafy to the top : leaves membranaceous, cordate or some of them ovate- 

 deltoid, crenate, 2 to 4 inches long, sprinkled beneath with some minute resinous 

 atoms, slender-petioled : heads terminal and from the upper axils, on short slender 

 peduncles. Parthenopsis maritimus, Kellogg in Proc. Calif. Acad. v. 100. 



Rocky banks of streams, &c., Santa Barbara and southward. Heads handsome, fully two 

 inches broad, including the (about 15) long rays. It would be well worthy of cultivation. The 

 genus commemorates an early writer upon California, the Jesuit missionary, Michael Venegas. 



63. RIDDELLIA, Nutt. 



Heads several-flowered, with 3 or 4 pistillate rays and 5 to 12 disk-flowers, all 

 fertile. Involucre narrow, cylindraceous, of 4 to 10 linear-oblong and coriaceous 

 equal woolly scales, which are connivent but distinct, except at the very base, and 

 a few thinner or scarious ones within, sometimes a narrow external bract or two. 

 Eeceptacle flat, naked and smooth. Rays large for the size of the head, very broad, 

 abruptly contracted at base into a short tube, truncate and 3-lobed at the end, 5-7- 

 nerved (the nerves converging and uniting in pairs within the lobes), becoming 

 papery, persistent on the akene. Disk-corollas elongated-cylindraceous, with a very 

 short proper tube, 5-toothed at summit ; the teeth glandular. Anthers linear, mi- 

 nutely sagittate or emarginate at base. Style-branches of the disk-flowers short, 

 truncate-capitate at the apex. Akenes narrow, terete or nearly so, obscurely striate 

 or angled, glabrous, or in one species cobwebby-villous. Pappus of 4 to 6 hyaline 

 nerveless and pointless chaffy scales. Low and branching woolly herbs, probably 

 all perennial ; with alternate spatulate or linear leaves, either entire or the radical 

 ones pinnately incised, and corymbose small heads of golden yellow flowers, much 

 resembling those of a section of Zinnia which belongs to the same region. Gray, 

 PI. Fendl. 94, & Proc. Am. Acad. vii. 358. 



There are three species, all of the Texano-Arizonian region ; namely, R. arachnoidea, of Texas 

 and Northern Mexico, which is remarkable for the long cobwebby hairs on the akene, and the 

 pappus-scales as it were dissolved at the apex into similar hairs ; 1L tagetina of Nuttall, with 



