138 COMPOSIT.-E. Bigelovia. 



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

 prominent cliaft'y cnsp. — Linos/jris Bigelovii, Gray, Pacif. Ex. Exp. iv. 98, t. 12. — N. New 

 Mexico and adjacent Colorado ; first coll. by Bicfelow. 



H— -1— Akenes (smaller) canesceutly pubescent or villous (B leiosper-nia excepted!): herbage 

 coninionl}' graveolent, and in most species becoming more or less resinous-pruiuose or balsamic- 

 viscid. 



•H- 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 ar.d pale, 

 very strictly pentnstichous and about 5 in each vertical ranlv, all muticous; 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 junci- 

 form, mostly leafless, greenish and minutely canescent, apparently not becoming viscid : 

 bracts of the involucre acutisli, 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, canescent with a fine pannose tomentuni, or in age glabrate and becoming viscid- 

 ulons : sparse leaves often pre,sent, an inch or less long : bracts of the involucre obtuse : 

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

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

 of Pholisma, according to Pringle. 



-H- ++ Leaves numerous, filiform or nearly so, not obviously punctate : heads .shorter: invohicral 

 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 

 pruinuse-resiuous : 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 

 shorte'r outermost muticous. — Proc. Am. Acad. viii. 643, & Bot. Calif, i. 316. Linosi/ris 

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

 Tejon Pass, iJr. Heermann. Not since seen. 



B. Grreenei, Gray. Suffmticose, 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 numeroirs and fastigiate-cymose, 3 or 4 lines high : bracts 

 of the sul)clavate involucre fewer and firmer-chartaceous, oblong, abruptly subulate-tipped or 

 shoi't outermost mucronate, only about 3 in each vertical rank, these ranks comparatively 

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

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

 Cailon, Utah, M. E. Jones. 



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

 branchlcts, but at length balsamic-viscid or pruinose-waxy: notomentum: heads open-panicu- 

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

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

 oblong lobes or teeth : pappus soft : low-shrubby, fastigiately or paniculately much branched, 

 \cvy leafy: leaves an inch or less long. 



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

 broadly linear, rather firm-cliartaceous, in about 4 vertical ranks, all but iimermost tipped 

 witli a greenish and glandular snbapical spot. — Pi-oc. Am. Acad. viii. 644, & Bot. Calif, 

 i. 316. Linosipis teretifolia, Durand & Ililgard, 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 ])aniculate : involncral bracts broader, 

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

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

 First coll. by Sclwtt, later by Parry, Parisli, Palmer. 



