COMPOSITAE (COMPOSITE FAMILY) 787 



and often glutinous, much branched, with narrowly linear entire alternate 

 leaves, and small heads of yellow flowers in fastigiate or paniculate cymes. 

 (Named for Pedro Gutierrez, correspondent of the botanical garden of Madrid.) 

 1. G. Sarbthrae (Pursh) Britton & Rusby. Low; leaves numerous, 1-5 cm. 

 long ; heads usually crowded, the disk- and short ray-flowers usually 3 or 4 each. 

 {G. JEuthamiae T. & G.) Dry plains, Man. and Minn., westw. and south westw. 

 July- Sept. 



12. AMPHlACHYRIS (DC.) Nutt. 



Heads hemispherical ; rays 5-10. Disk-flowers perfect but infertile. Pappus 

 of the rays minute, coroniform ; of the disk-flowers of bristle-like scales, more or 

 less dilated and united at base. A diffusely much branched annual, with heads 

 solitary on the branchlets ; otherwise as Gutierrezia. (From a^L, around, and 

 &-)(_vpov, chaff.} 



1. A. dracunculoides (DC.) Nutt. Low, slender; leaves narrowly linear, 

 the upper filiform ; disk-flowers 10-20, their pappus of 5-8 bristle-like scales 

 united at base and slightly dilated upward. Plains, Mo., Kan., and southw. 

 Aug., Sept. 



13. HETEROTHECA Cass. 



Characters as in Chrysopsis, but the achenes of the ray thickish or triangular, 

 without pappus or obscurely crowned, and those of the disk compressed, with a 

 double pappus, the inner of numerous long bristles, the outer of many short and 

 stout bristles. (From 2re/>os, different, and 0^*77, case, alluding to the unlike 

 achenes.) 



1. H. subaxillaris (Lam.) Britton & Rusby. Annual or biennial, 3-9 dm. 

 high, bearing numerous small heads; leaves oval or oblong, the lower with 

 petioles auricled at base, the upper mostly subcordate-clasping. (H. Lamarckii 

 Cass.) Sandy soil, near the coast, Del. to Fla. and Tex., inland to Kan., N. 

 Mex. , and Ariz. ; locally on ballast north w. July-Sept. (Mex.) 



14. CHRYS6PSIS Nutt. GOLDEN ASTER 



Heads many-flowered, radiate; the rays numerous, pistillate. Involucral 

 bracts linear, imbricated, without herbaceous tips. Receptacle flat. Achenes 

 obovate or linear-oblong, flattened, hairy ; pappus in all the flowers double, the 

 outer of very short and somewhat chaffy bristles, the inner of long capillary 

 bristles. Chiefly perennial low herbs, woolly or hairy, with rather large often 

 corymbose heads terminating the branches. Disk- and ray-flowers yellow. 

 (Name composed of xp"cr6s, gold, and 8\{/is, aspect, from the golden blossoms.) 



* Leaves narrowly lanceolate or linear ; achenes linear. 



1. C. graminifblia (Michx.) Nutt. Silvery-silky, with long close-pressed 

 hairs ; stem slender, often with runners from the base, naked above, bearing 

 few heads ; leaves lanceolate or linear, elongated, grass-like, nerved, shining, 

 entire. Dry sandy soil, N. J. and Del. to Ky., southw. and southwestw. 

 July-Oct. 



2. C. falcata (Pursh) Ell. Stems 1-3 dm. high, very woolly ; leaves crowded, 

 linear, rigid, about 3-nerved, entire, somewhat recurved or scythe-shaped, hairy, 

 or smooth when old, sessile ; heads small, corymbed. Dry sandy soil on the 

 coast, pine barrens of N. J. to Cape Cod, Mass. July-Sept. 



* * Leaves oblong or lanceolate, entire or slightly serrate, mostly sessile, veined, 

 not nerved ; achenes obovate, flattened. 



- Pubescence soft-villous or arachnoid and floccose. 



3. C. mariana (L.) Nutt. Perennial, silky with long and weak hairs, or 

 when old smoothish ; leaves oblong; heads corymbed, on glandular peduncles 

 Dry barrens, from N ^ r . and Pa. southw. Aug. -Oct. 



