Guardiola. COMPOSITE. 237 



m<any, long and slender: akenes 4-sided, glabrous. — Fl. Dau. t. 728; Lam. 111. t. 680; 

 Sibth. Fl. Grajc. t. 873. — Eoadsides and pastures, escaped from gardens, and v.-ell established 

 in the older States. (Xat. from Eu.) 



63. ADENOCAtTLON, Hook. ('ASr/r, a gland, and Kai;Xor, stem.) — 

 Perennial herbs ; with alternate and dilated leaves on long and margined petioles, 

 slender stems naked and paniculately braiached above, and bearing very small 

 heads of whitish flowers ; the peduncles, &c., beset with stalked glands (whence 

 the name) like those of the akenes but less stout. Floccose avooI caducous, 

 except on the lower face of the leaves.' — Hook. Bot. Misc. i. 119, t. 15, & Fl. i. 

 308; Maxim. Fl. Amur. 152; Gray, Proc. Am. Acad. viii. 653, & xvii. 214. 



A. bicolor, Hook. 1. c. Stem 1 to 3 feet high, leafy below : leaves ample, deltoid-cordate, 

 coarsely sinuate-dentate or repand or slightly lobed, early glabrate and green above, white 

 with the thin cottony wool beneath : bracts of the involucre 4 or 5 in a single series, ovate, 

 reflexed in fruit, several times shorter than the (4 to G) club-shaped akenes. — Gray, Bot. 

 Calif, i. 335. — Damp woods, California to Brit. Columbia and east to Lake Superior : 

 fl. summer. Quite distinct from the Chilian, less so from the Amur-Himalayan .species. 



Tribe V. HELIANTHOIDE^, p. 59. 



64. PLtTMMERA, Gray. (Sara Plummer, now Mrs. J. G. Lemmon, the 

 discoverer. Slie and her husband have shared together the toils, privations, and 

 dangers of arduous explorations in the wilds of Arizona and California, as well 

 as in the delights of very numerous discoveries : so that wherever the name of 

 Lemmon is cited for Arizonian plants, it in fact refers to this pair of most enthu- 

 siastic botanists.) — Proc. Am. Acad. xvii. 215. — Single species. 



P. floribunda, Gray, 1. c. Erect and rather stout herb, apparently from a biennial root, 

 2 or 3 feet liigli, nearly glabrous, with bitter-aromatic odor and savor, fastigiatelv and corym- 

 bosely much branched above : branches terminating in loose cymes of numerous pedunculate 

 heads: leaves all alternate, 1-3-ternately parted into filiform lobes, impressed-punctate : 

 involucre only 2 lines long : corollas golden-yellow ; those of the ray nearly glabrous, of the 

 di.sk densely puberulent-glandular. — S. Arizona, in Apache Pass, Mr. &, Mrs. Lemmon. — 

 Corollas, involucre, odoi-, &c., nearly of Actindla, sect. Picrudenia. 



Q5. DICRANOC ARPUS, Gray. {^Upavov, a pitchfork, KapTro's, fruit.) — 

 Mem. Am. Acad. v. 322 (PI. Thnrb.), & Bot. Mex. Bound. 85. — Single species. 



D. parviflorus, Gray, 1. c. Branching annual, a foot or less high, nearly glal)rous : leaves 

 all opposite, 1-2-ternately divided into filiform lobes, or the uppermost nearly simple : heads 

 more or less pedunculate and ])aniculate, terminating slender In-anches, in flower a line long, 

 yellowish : longest akenes 4 lines and their horns often 3 lines in length. — Ildcrospermum 

 dicranocarpum, Gray, PI. Wright, i. 109. — W. Texas, near the Pecos, Wriijld. (Adj. Mex., 

 Parr I), Palmer.) 



66. G-UARDtOLA, Ilumb. & Bonjil. (The name of a Spanish natural- 

 ist.) — Perennial herbs (of Mexico and its northern borders), glabrous, branch- 

 ing ; with merely serrate and commonly petiolate veiny ' leaves ; the branches 

 terminated by the cymulose-clustered heads of white flowers. — PI. iEquin. i. 144, 

 t. 41 ; Gray, PI. Wright, i. 110; Benth. & Hook. Gen. ii. 347. Tuhcarpus, 

 Hook. & Arn. Bot. Be'ech. 298, t. 63. 



G. platyph^lla, Gray. Somewhat glaucous, 2 or 3 feet high, corj'mbosely branched : 

 leaves roundish-ovate, very obtuse, rigidly denticulate or dentate, commonly subcordate (the 



