240 COMPOSITE. IsoPAPPus. 



plants. The specimens we have examined are in the herbarium of Sir 

 Wra. Hooker. 



47. APLOPAPPUS. Cass. ; DC. prodr. 5. p. 345, exc\. spec. 



Heads many-flowered ; the ray-flowers numerous, ligulate, pistillate, 

 sometimes wanting ; those of the disk tubular, perfect. Scales of the invo- 

 lucre lanceolate or linear, imbricated. Receptacle flat, foveolate, or alveo- 

 late and somewhat fimbrillate. Achenia silky, somewhat terete, oblong or 

 turbinate. Pappus of copious unequal and more or less rigid scabrous bris- 

 tles. — Mostly perennial herbs or suflTruticose plants (chiefly natives of the 

 Andes and the Pacific coast of America) ; with alternate usually serrate or 

 spinulose-toothed leaves. Heads solitary or somewhat corymbose. Flowers 

 yellow. 



We have no species which entirely accord with the Chilian Euaplopappi. Some 

 of the Aplodisci are most nearly alhed to them, except that they have no rays ; but 

 the presence or absence of rays appears to be of minor consequence when the capi- 

 tula are homochromous. Perhaps Pyrrocoma and Prionopsis hardly deserve the 

 rank of genera, but it is more convenient to separate them. 



§ 1. Scales of the hemisjjJierical or campanulate involucre linear-lanceolate : 

 achenia obovoid-oblong or turbinate, silky-villous : pappus of copious and 

 very unequal but nearly capillary bristles : perennial or suffrutescent : 

 leaves pinnately lobed or incised ; the lobes or teeth pointed ivith bristles.-— 

 Blepharodon, DC. (excl. no. 9.) 



1. A. rubiginosus : sufFruticose ? branclrlng from the base, viscidly pubes- 

 cent and cinereous : leaves lanceolate or narrowly oblong, mostly narrowed 

 at the base, sessile, laciniate-incised ; the divaricate teeth produced into pel- 

 lucid bristles ; heads subglobose, solitary or corymbose, terminating the leafy 

 branches, often bracteate ; scales of the involucre linear, acute, viscidly pu- 

 berulont, in about 2 series, nearly e(iual, loose, at length spreading ; achenia 

 turbinate, densely silky-villous; pappus bright reddish-brown. 



Texas, Druminond ! — Stems erect or decumbent, corymbosely branched, 

 about 10 inches high. Heads rather smaller than in Chrysopsis Mariana, 

 on short stout peduncles. Kays 15-18, elongated. Scales of the involucre 

 tipped with a bristle. Alveoli of the receptacle pllose-fimbrillate. Corolla of 

 the disk-flowers dilated at the throat, rather deeply toothed. Appendages of 

 the style oblong-ovate, broader and much shorter than the stigmatic portion. 

 Achenia sllky-canescent. Bristles of the pappus in about 3 series of unequal 

 length. — Allied apparently to A. phyllocephalus, DC, of Mexico. 



2. A. spinulosus (DC.) : herbaceous ; canescent with a soft minute woolly 

 pubescence, or at length almost glabrous ; stems many from the same root, 

 corymbosely branched above ; leaves (small) rigid, pinnately or somewhat 

 bipinnately parted ; the segments short, linear-subulate, mucronate with a 

 short bristle ; heads subglobose, terminating the numerous branchlets; invo- 

 lucre shorter than the disk ; the scales subulate-lanceolate, mucronulate, 

 imbricated in 3-4 series, appressed, canescent; achenia turbinate, villous ; 

 pappus (pale or tawny) very unequal. — DC. I.e. — Amellus? spinulosus, 

 Pursh, fl. 2. p. 564, (but the descr. does not perfectly accord); Torr.! in 

 ann. lye. New York, 2. p. 213. Starkea? pinnata, Nutt. ! gen. 2. p. 169. 

 Diplopappus pinnatifidus, Hook. ! fl. Bar.- Am. 2. p. 22. Dieteria spinulosa, 

 Nutt. ! in trans. A7ner. phil. soc. I. c. j). 301. 



Plains of the Missouri to the Rocky Mountains ! Aug.-Sept. — Stems 1-2 



