Zexmenia. COMPOSITE. 285 



* * Chaffy bracts of the receptacle rather firm-chartacenus: stems a foot or two high. 

 H. Douglasii, TORR. & GRAY, extended. Hirsute-pubescent with spreading hairs, at least 

 the upper part of the stem : leaves mostly opposite and oblong-lanceolate ; upper sessile or 

 nearly so : disk of the head an inch broad : involucre hirsute : rays an inch long : akenes 

 obovate, more or less ciliate-fringed : pappus a pair of elongated awns with more or less 

 chaffy-dilated base, or sometimes (as in the original specimen) reduced to this base, and with 

 mostly conspicuous squamellae. H. Douglasii, Torr. & Gray, Fl. ii. 334. H. lanceofalii, 

 Torr. in Wilkes Ex. Exped. xvii. 354, hardly of Torr. & Gray, Fl. Dry ground, W. Idaho 

 and E. Oregon and Washington Terr., Douglas (awns of pappus reduced, perhaps not con- 

 stantly), Spalding, Cusick, Branderjee. Ciliation of ovary and akeue variable, sometimes 

 wanting except near the summit. 



H. uniflora, TORR. & GRAY, 1. c. Minutely pubescent or somewhat scabridous, or glabrate : 

 leaves more commonly opposite, sometimes all alternate, oblong-lanceolate (2 to 5 inches 

 long); lower short-petioled : involucre pubescent or slightly hirsute : rays a full inch long: 

 akenes more or less ciliate : pappus a pair of long awns and* rather conspicuous squamelhv. 

 Gray, Proc. Am. Acad. xix. 10. //. lanceolate, Torr. & Gray, 1 c. (Leiyhia luncrolata, Nutt: 

 Trans. Am. Phil. Soc. vii. 365, which is said by Nuttall to have three or more heads, but of 

 which we have only two or three flowers, is probably of this species). H. multicaulis, Eaton 

 in Bot. King Exp. 170, small form. Hcltanthus ttnifloriis, Nutt. Jour. Acad. Philad. vii. 37, 

 & Leif/hia uniflora, Nutt. Trans. Am. Phil. Soc. 1. c., by char, and genuine specimens. Rocky 

 Mountains, Montana and E. Idaho to S. Utah, Wijeth, Burke, Watson, Ward, &c. 



H. Californica, GRAY. Minutely scabrous-puberulent or almost glabrous: stems slender, 

 rarely bearing 2 or 3 small heads : leaves more commonly alternate, lanceolate, nearly all 

 tapering into slender or distinct petioles : rays half-inch or more long, usually little sur- 

 passing the involucre : akeues obovate, wholly glabrous, the roundish summit slightly 

 notched at maturity, minutely 2-aristellate and with very short squainellse, but whole pappus 

 often obsolete in age, margins very obscurely ciliolate near the summit. Pacif. II. I\ep. 

 iv. 103; Bot. Calif, i. 352. California, from Xapa Valley to the Sierra Nevada, from the 

 heads of the Sacramento to Mariposa Co. ; first coll. by Bigelow. 



3. PsEUDO-HELijfNTHUs. Habit of the narrow-leaved Helianthi : slender 

 and leafy-stemmed : leaves all linear and one-nerved, with revolute margins, 

 alternate, hispidulous-scabrous : bracts of the involucre linear-attenuate, hispid, 

 squarrose-spreading : rays long and narrow : style-appendages of the disk-flowers 

 long and slender, hirsute : chaffy bracts of the receptacle rather rigid, obscurely 

 3-toothed at the apex : akenes less flat, the lateral angles being usually devel- 

 oped, or even quadrangular. 



H. grand.ifl.6ra, TORR. & GRAY, 1. c. Stem 3 or 4 feet high (the base unknown) : leaves 

 somewhat broadly linear (2 lines wide by 2 inches or more long), strongly papillose-scabrous 

 above: head nearly three-fourths inch high and broad : rays 16 to 20, inch and a half long: 

 immature akenes broadly oblong, glabrous below, the acute almost winged margins produced 

 on each side at apex into a chaffy tooth, and one or both of these commonly extended into 

 a chaffy persistent awn, the salient border connecting them villous and minutely multi- 

 squamellate. E. Florida, Leavemcorth, Barrows. Mature akenes not seen. 



H. tenuifolia, TORR. & GRAY, 1. c. Stem 2 feet or more high, more slender and simple 

 from a narrow somewhat moniliform horizontal tuber : leaves nearly filiform : head one 

 half smaller: rays 10 to 15, an inch or more long: akeues slightly pubescent, quadrangular 

 and moderately or the outer very little compressed, the anterior and posterior angles nar- 

 rowly and acutely margined, these two and sometimes the other angles surmounted by a 

 subulate or triangular short persistent chaffy and pointed tooth, and with some minute 

 intermediate squamellaj. Sandhills and dry pine barrens on and near the Apalachicola 

 River, Florida, Chapman, Mohr. 



108. ZEXMENIA, Llave & Lex. (Anagram of Ximenez, the genus 

 being likened to Ximene&ia.} Mexican genus of numerous species, two of them 

 reaching U. S., perennial herbs or some rather shrubby ; with mostly opposite 



