400 POLYGONACEAE 



bristle-tipped, 1 to 3 lines long ; flowers 7 to 11 ; calyx-tube subglobose, woolly, 

 the glabrous yellow lobes spreading from its orifice. 



Local species, known only from Lancaster in the Mohave Desert. 



Ref. OXYTHECA LUTEOLA Parry, Bull. Torr. Club, 10: 23 (1883), type loc. Lancaster, 

 Parry 259. 



2. 0. caryophylloides Parry. Stem erect but diffusely branching above 

 the base, 7 to 10 inches high, the involucres numerous along the branchlets and 

 terminal, on pedicels 1 to 4 lines long ; herbage glabrous or nearly so ; leaves 

 basal, obovate to oblong-spatulate, contracted to a petiole, % to 2 inches long ; 

 bracts f oliaceous, 3-parted into oblong divisions ; involucres deeply parted into 

 5 nearly equal divisions, the divisions oblong, or a little widened upward, and 

 abruptly awned ; flowers 2 or 3 ; calyx short, greenish, obscurely lobed. 



San Bernardino and San Jacinto mountains, 4000 to 6000 feet. 

 Locs. Deep Creek, San Bernardino Mts., Hall; Fuller's Mill, Mt. San Jacinto, Hall. 

 Ref. OXYTHECA CARYOPHYLLOIDES Parry, Proc. Davenp. Acad. 3: 175 (1882), type loc. 

 San Bernardino Mts., Parish Bros. 1097. 



3. 0. trilobata Gray. Stems one, sometimes several from the base, once 

 trichotomous, then dichotomous, 4 to 14 inches high, the branches spreading; 

 leaves in a basal tuft, spatulate, V% to 2 inches long, a little hairy; herbage 

 sparingly glandular; bracts 3-lobed, the lobes acerose; involucres glabrous, 

 glaucous, deeply 5-parted, borne on slender pedicels; pedicels solitary in the 

 forks and axils of the bracts; involucre deeply lobed, its lobes oblong or 

 spatulate, tipped with a bristle, 2 to 3 lines long; calyx segments 3-cleft into 

 lanceolate acuminate lobes slightly erosulate on the sides. 



Dry valleys: San Bernardino Valley south to San Diego Co. 



Locs. San Bernardino, Parish 3795; Mt. San Jacinto, Hall 2082, Jepson 2283; Coyote 

 Canon, Jepson 1434; between Julian and Cuyamaca, K. Brandegee (involucral lobes broad, 

 often 2 or 3-toothed), Abrams 3807; Descanso, Stokes; Jacumba, Abrams 3663. 



Ref. OXYTHECA TRILOBATA Gray, Proc. Am. Acad. 12: 83 (1876), type loc. San Bernar- 

 dino Valley, Lemmon 4" Parry. 



4. 0. emarginata Hall. Stem erect, tri- and di-chotomous, 2 to 6 inches 

 high, the involucres in the forks and terminal on pedicels 1 to 6 lines long; 

 herbage reddish, sparingly and minutely glandular; leaves in a basal rosette, 

 oblanceolate, 4 to 8 lines long ; bracts mostly 3-lobed ; involucres obpyramidal, 

 2 to 3 lines high, shallowly 5-lobed, the lobes rounded, scarious-margined, awn- 

 tipped ; flowers 4 ; calyx 6-parted, its segments oblanceolate, fimbriate at apex. 



Ridges about Tahquitz Peak, San Jacinto Mts., July. A rare and interesting 

 species; possibly passed over elsewhere for 0. perfoliata which it superficially 

 resembles. 



Ref. OXYTHECA EMARGINATA Hall, Univ. Cal. Publ. Bot. 1: 75, pi. 14 (1902), type loc. 

 Tahquitz Peak, Hall 2331. 



5. O. perfoliata T. & Gr. Stem erect but short, parting at the first node into 

 2 or 3 horizontally spreading branches 2 to 4 inches long; herbage slate-color 

 or reddish, glabrous except a glandular band on lower half of internodes; 

 leaves of the basal rosette oblong-oblanceolate, green, 6 to 12 lines long ; bracts 

 at first node 3 or 4, small, united only at base, the upper bracts very con- 

 spicuous, orbicular- or deltoid-perfoliate, spine-tipped at the angles, 4 to 9 

 lines broad, glaucous; involucre narrowly turbinate, 3 to 4 lines long, deeply 

 and acutely 4-lobed, each lobe bristle-tipped; calyx whitish, % line long, the 

 outer segments minutely white-scaly. 



Mohave Desert northward to Lassen Co. Nevada, Arizona. 



Locs. Victor, Hall 6181; Barstow, Jepson 5517; Argus Mts., Purpus 5315; Springville, 

 Middle Tule River, Purpus 6054; Honey Lake Valley, Davy. 



Refs. OXYTHECA PERFOLIATA T. & G. Proc. Am. Acad. 8: 191 (1870), type specimens 

 from Nev.; Wats. Bot. King, 311, pi. 34, figs. 1-3 (1871). 



