138 COMPOSITE. Bigelovia. 



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

 prominent dm fly cusp. Ltitos,/ri* Bi ; /flocii, Gray, Paeif. Ex. Exp. iv. 98, t. 12. N. New 

 Mexico and adjacent Colorado; first coll. by Biyelow. 



H H- Akcnes (smaller) canescently pubescent or villous (B. leiosperma excepted!): herbage 

 cominonlv grave., 'cut, and in most species becoming- more or less resinous-pruinose or balsamic- 

 viscid. 



-i-i- Leafless or sparsely leaved, shrubby, with rush-like or broom-like branches, 2 feet or more 

 hii,'h: leaves when present filiform, not punctate: beads fasciculate-clustered: involucre some- 

 what clavatc, 4 or 5 lines long, very glabrous; the bracts wholly thin-cbartaceous aid 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, GREEXE. Strict, fastigiately very much branched : branches slender and junci- 

 forni, mostly leafless, greenish and minutely canesceut, 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 Mull's of the Gila, near the Xe\v Mexican boundary, Greene. 



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

 branches, canescent 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, ined. B. juitcea, Gray 

 in distrib. Pi-ingle, not Greene. On the Mohave Desert, Greene, Parry, Princjle. Host-plant 

 of Pliii/isiitii, according to Priugle. 



.,_,. ++ Leaves numerous, filiform or nearly so, not obviously punctate : beads 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, balsam ic-viscidnlous or 

 pruinose-resinons : leaves rather scattered on the slender branches, spreading or recurving: 

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

 rowly lanceolate, abruptly producr-.l into a spreading setiform tip or short awn, or the much 

 shorter outermost muticous. Proc. Am. Acad. viii. 64-8, & Bot. Calif, i. 316. Lhwsi/ris 

 ceruminosa, Durand & llilgard, PI. Ileerm., & Pacif. R. Rep. v. 9, t. 6. S. California in 

 Tejou Pass, I>r. Il<> r ii, a mi. Not since seen. 



B. Greenei, Gi:.\v. Snffruticose, 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 subdavate in\u]ucre fewer and firmer-chartaceous, oblong, abruptly subulate-tipped or 

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

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

 IIiuTl'ano Plains, Greene. Near Twin Lakes in the Colorado Mountains, and Cottonwood 

 CaTion, Utah, M. E. Jones. 



H- -H- -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 i.f the evlindraceous involucre less numerous, only '! or 4 in each 

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

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

 very leafy: leaves an inch or less long. 



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

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

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

 i. .'ilfi. Linosyi is teretifolia, Duiand & llilgard, PI. Heerm., & Pacif. R. Rep. v. 9, t. 7. Arid 

 hills, S. E. California, bordering the Mohave Desert; first coll. by Dr. Heermt.mn. 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 viscidifloru , var. 

 ]i,i,,!rnlfit<t, Gray, Bot. Mex. Bound. 80. Desert wastes, San Bernardino Co. to S. Utah? 

 1'irst coll. by Scfiutt, later by Parry, Parish, Palmer. 



