lo8 COMPOSIT.E. Bigeloma. 



form : involucral bracts lanceolate, acute, thinuish, all pale : receptacle sometimes bearing a 

 prominent chaffy cusp. — L/nosip-is Bigdovii, Gray, Pacif. Ex. Exp. iv. 98, t. 12. — N. New 

 Mexico and adjacent Colorado ; first coll. by Bi<jelow. 



-4— 4— Akenes (smaller) canescently pubescent or villous (B. leinsperma excepted!): herbaii;e 

 commonly graveo'ent, and' in most species becoming more or less resinous-priiiiiose or balsanue- 

 viscid. 

 ++ Leafless or sparsely leaved, shrubby, with rush-lil^e or broom-like branches, 2 feet or more 

 high: leaves when present filiform, not punctate: heads fasciculate-clustered: involucre some- 

 what clavate, 4 or 5 lines long, very glabrous; the bracts wholly thin-chartaceous and pale, 

 very strictly pent:istiehous and about 5 in each vertical rank, all muticcuis; the inner ones 

 linear, outer successively and regularly shorter, outermost minute: akenes slender, appressed- 

 'villous. 

 B. juncea, Greexe. Strict, fastigiately very much branched : branches slender and juuci- 

 furni, mostly leafless, greenish and minutely cauescent, apparently not becoming viscid : 

 bracts of the involucre acutish, at least the innermost : corolla-lobes short-lanceolate, in the 

 bud externally beset with delicate long hairs. — Bot. Gazette, vi. 184. — E. Arizona, on cal- 

 careous bluffs of the Gila, near the New Mexican boundary, Greene. 

 B. Mohavensis, Griene. Stouter, with fewer and looser sometimes flexuous rigid 

 branches, cauescent with a fine panuose tomentum, or in age glabrate and becoming viscid- 

 ulous : sparse leaves often present, an inch or less long : bracts of the involucre obtuse : 

 corolla-lobes narrowly lanceolate, wholly glabrous. — Bull. Torr. Club, iued. B. juncea. Gray 

 in distrib. Pringle, not Greene. — On the Mohave Desert, Greene, Parrij, Prinyle. Host-plant 

 of Pholisma, according to Pringle. 



•H- -H- Leaves numerous, liliform or nearly so, not obviously punctate : heads shorter: inviducral 

 bracts 3 or 4 in each vertical rank, some or most of them with small setaceous or subulate 

 spreading or recurving tips: lobes of 5-cloft limb of corolla linear or linear-lanceolate: stems 

 fastigiateh'- branched. 

 B. ceruminosa. Gray. Shrubby, a foot or two high, glabrate, balsaniic-viscidulous or 

 prui nose-resinous: leaves rather scattered on tlie slender branches, spreading or recurving: 

 heads cymose-fascicled, about 5 lines long, narrow: bracts of the viscidly lucid involucre nar- 

 rowly lanceolate, abruptly produced into a spreading setiform tip or short awn, or the much 

 shorter outermost muticous. — Proc. Am. Acad. viii. 648, & Bot. Calif, i. 316. Linosyris 

 ceruminosa, Durand & Ililgard, PI. Heerm., & Pacif. K. Rep. v. 9, t. 6. — S. California in 

 Tejon Pass, Dr. Heermann. Not since seen. 

 B. Greenei, Gu.\y. Suffruticose, about a foot high, green and glabrous, more or less bal- 

 samic-viscid : leaves very numerous on the branches, filiform-acerose, but flat and margins 

 minutely ciliolate-scabrous : heads numerous and fastigiate-cymose, 3 or 4 lines high : bracts 

 of the subclavate involucre fewer and firmer-chartaceous, oblong, abruptly sulnilate-tipped or 

 short outermost mucronate, only about 3 in each vertical rank, these ranks comparatively 

 indistinct : anthers and stigmas less exserted. — Proc. Am. Acad. xi. 75. — Colorado ; on the 

 Huerfano Plains, Greene. Near Twin Lakes in the Colorado Mountains, and Cottonwood 

 Canon, Utah, M. E. Jones. 



++++++ Leaves numerous, all involute-filiform, resinous-punctate and glabrous, as are the 

 branchlcts, but at length balsamic-viscid or pruinose-waxy : no tomentum: heads open-panicu- 

 late, 4 or 5 lines high: bracts of the cylindraceous involucre loss numerous, only 3 or 4 in each 

 vertical rank, from oblong to linear, obtuse and pointless, little carinate: corolla with short 

 ohlong lobes or teeth: pappus soft: low-shrubby, fastigiately or pauiculately much branched, 

 very leafy: leaves an inch or less long. 

 B. teretifolia, Gray. Branches rigid, fastigiate : involucral bracts narrowly oblong to 

 broadly linear, rather firm-chartaceous, in about 4 vertical ranks, all but innermost tipped 

 with a greenish and glandular subapical spot. — Proc. Am. Acad. viii. 644, «& Bot. Calif, 

 i. 316. LInosijn's teretifolia, Eurand & Hilgard, PI. Heerm., & Pacif. R. Rep. v. 9, t. 7. — Arid 

 hills, S. E. California, bordering the Mohave Desert; first coll. by Dr. Heermann. Perhaps 

 also in Arizona. 

 B. paniculata, Gray, 1. c. Less woody, more paniculate : involucral bracts broader, 

 thinner, about 3 in each vertical rank, pale and wholly naked. — Linosi/ris viscidiflora, var. 

 pnuiculata, Gray, Bot. Mex. Bound. 80. — Desert wastes, San Bernardino Co. to S. Utah ? 

 First coll. by Sc/wtt, later by Parry, Parish, Palmer. 



