136 COMPOSITE. Bigelovia. 



(excl. § 3) ; Gray, Proc. Am. Acad. viii. 638 ; Benth. & Hook. Gen. ii. 1232. 

 Chrysothamnus, Nutt. Trans. Am. Phil. Soc. ser. 2, vii. 323; Benth. & Hook. 

 Gen. ii. 255. Linosyris, Torr. & Gray, Fl. ii. 232, not Cass., which Old- World 

 genus differs in that its heads when perchance heterogamous are heterochromous. 

 The various types in the genus are connected by gradations, so that the sections 

 are not very distinct. 



§ 1. Chetsothamnopsis, Gray, 1. c. Heads comparatively large but narrow, 

 at least half-inch long, 5-20-flowered : bracts of the involucre comparatively 

 large, chartaceous and acuminate, and some outer ones prolonged into a slender 

 herbaceous tip or appendage ; when numerous the vertical ranks become more 

 or less apparent : corollas 5-toothed or barely 5-lobed at summit : low and suffru- 

 tescent, with linear entire leaves, not punctate nor viscid or resinous, except that 

 the first species is slightly so. 



# Genuine: style-appendages setaceous-subulate or filiform, conspicuously exserted out of the 

 corolla: akenes slender, sericeous-pubescent: anther-tips oblong-lanceolate: involucre cylin- 

 draceous, shorter than the developed (5 to 15) flowers and pappus : stems or branches whitened 

 (at least when young) by a close pannose tomentum : heads thyrsoidly paniculate or glomerate. 

 Connects on one hand with Aplopappus § Macronema, on the other with § Chrysothamnus. 

 B. ceruminosa, of the latter, approaches this group. 



4— Bracts of the involucre comparatively few, not showing obvious vertical ranks. 



B. Bolanderi, Gkat, 1. c. Leaves oblanceolate-linear or narrower, green and glabrate, 

 somewhat viscidulous (about inch long), very obscurely 3-nerved : heads few and clustered, 

 sometimes three-fourths inch long, 5-11-flowered : bracts of the involucre only about 10, thin- 

 ehartaceous, lanceolate, with a soft acuminate apex, or one or two outermost herbaceous- 

 tipped : alveoli of the receptacle paleaceous-dentate. — B. Bolanderi & B. Howardii in part 

 (sp. Boland.), Gray, Bot. Calif, i. 315, 316. Linosyris Bolanderi, Gray, Proc. Am. Acad, 

 vii. 354. — Mono Pass in the Sierra Nevada, California, at 10,000 feet, Bolander. 



B. Parryi, Gray, 1. c. Not viscidulous: stems rather strict, leafy to the summit: leaves 

 linear (2 or 3 inches long, 2 lines or less wide), obscurely 3-nerved, glabrous; upper ones 

 hardly diminished in size and overtopping all the heads of the strict and narrow thyrsiform- 

 virgate panicle: heads little over half-inch long, 10-15-flowered: bracts of the involucre 

 about 12, lanceolate and gradually acuminate, rather prominently 1-nerved, thin-chartaceous, 

 a few exterior tapering into a prolonged subulate-linear herbaceous appendage : alveoli of 

 receptacle short and nearly entire. — Linosyris Parryi, Gray in Proc. Acad. Philad. 1863, 66. 

 — Parks of the Colorado Rocky Mountains, Parry, Hall & Harbour, &c. 



-f— -f- Bracts of the involucre more numerous and disposed to fall into 4 or 5 vertical ranks, in 

 the manner of § Chrysothamnus. 



B. Nevadensis. Rigid, more branching, cinereous-puberulent or tomentulose when young : 

 leaves coriaceous, oblanceolate to linear, mucronate (the mucro generally recurving), ob- 

 scurely or not at all 3-nerved, at most inch long : heads few and glomerate at the naked 

 summit of the branches, often three-fourths inch long, 5-flowered : bracts of cylindrical 

 involucre more imbricated and numerous (15 to 18), rigid-chartaceous, pubescent or some- 

 what hirsute-ciliate, all with prolonged slender acumination, outer broadly lanceolate or 

 oblong and with prolonged slender-subulate tip or appendage recurving and rigid, -r- 

 B. Howardi, var. Nevadensis, Gray, Proc. Am. Acad. viii. 641, & Bot. Calif, i. 316. Lino- 

 syris Howardi, var. Nevadensis, Gray, 1. c. vi. 541. — Eastern and arid portion of the Sierra 

 Nevada, &c, on the borders of California and Nevada, Bloomer, Anderson, Brewer, Watson, 

 &c. Is the analogue of Aplopappus Bloomeri. 



B. Howardi, Quay. Lower, more tufted, canescently tomentulose when young : leaves 

 narrowly linear, rigid (an inch or two long, barely a line wide), obscurely 1-nerved ; upper 

 mostly overtopping the glomerate (about half-inch long) narrow heads : involucre 5-flow- 

 ered, glabrous ; its bracts thinnish, lanceolate, apiculate-acuminate, or some loose outer ones 

 with prolonged subulate-filiform appendage. — Proc. Am. Acad. viii. 641, excl. var. Linosyris 

 Howardi, Parry, in Gray, Proc. Am. Acad. vi. 541, excl. var. — Parks of the Rocky Moun- 



