138 COMPOSITE. Bigelovia. 



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

 prominent chaffy cusp. — Linosyris Bigelovii, Gray, Pacif. Ex. Exp. iv. 98, t. 12; — N. New 

 Mexico and adjacent Colorado ; first coll. by Bigelow. 



-I— -)— Akenes (smaller) canescently pubescent or villous (B. leiosperma excepted!): herbage 

 commonly graveolent, and in most species becoming more or less resinous-pruinose or balsamic- 

 viscid. 



++ Leafless or sparsely leaved, shrubby, with rush-like 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 pentastichous and about 5 in each vertical rank, all muticous; the inner ones 

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

 villous. 



B. juncea, Geeejte. Strict, fastigiately very much branched : branches slender and junci- 

 form, mostly leafless, greenish and minutely canescent, 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. 1 84. — E. Arizona, on cal- 

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



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

 branches, canescent with a fine pannose 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, ined. B. juncea, Gray 

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

 of Pholisma, according to Pringle. 



■h- -H- Leaves numerous, filiform or nearly so, not obviously punctate : heads shorter: involucral 

 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-cleft limb of corolla linear or linear-lanceolate : stems 

 fastigiately branched. 



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

 pruinose-resinous : leaves rather scattered on the 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 & Hilgard, PI. Heerm., & Pacif. R. Eep. v. 9, t. 6. — S. California in 

 Tejon Pass, Dr. Heermann. Not since Seen. 



B. Greenei, Gray. 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 subulate-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 

 Caiion, Utah, M. E. Jones. 



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

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

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

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

 oblong lobes or teeth: pappus soft: low-shrubby, fastigiately or paniculately 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. Linosyris teretifolia, Durand & 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. panioulata, Gray, 1. c. Less woody, more paniculate : involucral bracts broader, 

 thinner, about 3 in each vertical rank, pale and wholly naked. — Linosyris viscidifiora, var. 

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

 First coll. by Schott, later by Parry, Parish, Palmer.- 



