302 



COMPOSITE. Gutierrezia. 



6. GUTIERREZIA, Lagasca. 



Heads corymbose, small or rather small, heterogamous ; the rays few and fertile ; 

 disk-flowers perfect (in one species apparently infertile). Involucre obovate or 

 cylindraceous, its scales coriaceous, with greenish tips, closely imbricated, the outer 

 ones shorter. Eeceptacle convex or conical. Eays short. Appendages of the 

 style lanceolate or linear, hispid. Akenes terete, often somewhat turbinate. Pap- 

 pus paleaceous, viz. of 7 to 9 or more chafiy scales, commonly distinct, and those 

 of the ray-flowers shorter than those of the disk (in some Eastern species short and 

 more or less united in a ring or crown). — Herbaceous or suffrutescent, glabrous, 

 often resinous, much branched from the base, with narrow entire leaves, and corym- 

 bose or fasciculate-crowded mostly small heads of bright yellow flowers. — Torr, & 

 Gray, Fl. ii. 193; Benth. & Hook. Gen. ii. 250, excl. sp. Brachyris, ISTutt. 



Two or three other species occur in Arizona, &c. , but have not yet been found near the Calif or- 

 nian borders. 



1. Gr. EuthamiSB, Torr. & Gray, 1. c. INIore or less woody at base, seldom 

 over a foot high : leaves narrowly linear, crowded : heads fastigiately corymbose 

 and crowded, or sometimes rather open-panicled : involucre turbinate, 2 lines long : 

 flowers of the ray and disk each 3 to 9 : akenes silky-pubescent : pappus of about 

 9 chatty scales ; those of the disk-flowers linear or oblong-linear and obtuse, fully 

 half the length of the corolla, at least as long as the akene ; those of the ray shorter 

 and broader. — G. Euthaviice, divaricata, & Calif arnica, Torr. & Gray, Fl. ii. 193. 

 Brachyris, Nutt. 



Dry hills along the coast and the Contra Costa Mountains : the var. Californica {G. Californica, 

 Torr. & Gray, 1. c.) ; taller than the eastern form, and usually with thicker lieads, containing 

 more numerous flowers, and the pappus rather longer. Tejon Valley, Dr. Hccrvmnn: a low form 

 with the fewest-flowered heads {G. microphylla, Durand & Hilgard, PI. Heerm. 40, — a Icvpsiis 

 ^oxG. microcejjhala), which extends from W. Nevada {Watson, &c.) to the east of the Rocky 

 Mountains. These are two extremes of apparently one variable and wide-spread species. — G. 

 microcephala. Gray, with which the Tejon plant was confounded, has still narrower, more cylindri- 

 cal, and smaller heads, with mostly a single disk-flower, and that infertile. 



2. G. linearifolia, Lagasca (1). Suffruticose or herbaceous, 1 to 2 feet high : 

 leaves narrowly linear : heads loosely corymbose : involucre obovate, 3 lines long : 

 akenes minutely appressed-pubescent : pappus of about 12 oblong and obtuse or 

 spatulate chaffy scales hardly longer than the proper tube of the corolla. 



Near Los Angeles, Dr. Gamhd. — In the size of the heads and in the pappus this accords 

 tolerably well with a specimen in Berlandier's collection. No. 1360, from San Luis Potosi, Mexico, 

 — which may be the obscure original of the genus, G. IviearifoHa. Yet the flowers are as many 

 as 5 to 8 in both ray and disk. It resembles the Chilian G. 2M7iicuIata ; but in that the scales 

 of the pappus are narrowly lanceolate and nearly equal to the disk-corolla. 



7. AMPHIACHYRIS, Torr. & Gray. (Sect, of Brachyris, DC.) 

 Heads corymlwse or fascicled, small, heterogamous ; the rays fertile ; disk-flowers 

 hermaphrodite but wholly or mostly sterile. Involucre obovate or cylindraceous ; its 

 scales rather few, coriaceous, closely imbricated, the outer successively shorter. 

 Eeceptacle convex. Eays 1 to 10 : disk-flowers from 5 to 20 : appendages of the 

 style in the latter oblong, obtuse. Akenes terete, pubescent. Pappus of the ray- 

 flowers chaffy and coroniform-concreted ; of the disk-flowers .setiform rather than 

 paleaceous, the very narrow scales or flatfish bristles about the length of the corolla 

 and commonly more or less united at the base. — Low and bushy-branched gla- 

 brous plants, Avith entire subsessile leaves and yellow flowers. — Gray, Proc. Am. 

 Acad. viii. 633. 



