Aplopappus. composite. 241 



feet high. Leaves an inch or more in length. Heads small. Rays 20-30. 

 Corolla of the disk with very short teeth. Style nearly as in the preceding, 

 but the appendages as long as the stigmalic portion. Pappus short, rather 

 rigid, very unecpial, in about 3 series. 



§ 2. Scales of the hemispherical involucre lanceolate, more or less imhricated : 

 achenia oblong or turbinate, villous : pappus of unequal and strongly scabrous 

 but almost capillary bristles: stems low, scape-like, from a fusiform, caudex, 

 hearing solitary or few rather large heads : leaves chiefly radical, petioled, 

 lanceolate, mostly with cartilaginous or spinulosc teeth. — Arnicella. 



• Scales of the involucre lanccolatc-ohlong, cluirtaceous, unequal, iinbricatcd in 3 series : 

 pappus slutrier than the corolla of the disk. 



3. A. lanceolatus : stem and petioles at first lanuginous, at length nearly 

 glabrous; leaves coriaceous; tlie radical and lowest cauline lanceolate, acute, 

 irregularly spinulose-toothed, petioled ; the upper small and bract-like, linear- 

 lanceolate, partly clasping; heads 2-5; achenia silky. — Donia lanceolata, 

 Hook. ! fl. Bor.-Am. 2. p. 25. Homopappus (Actinaphoria) multiflorus, 

 Nutt.! in trans. Amer. phil. soc. I. c. ]). 333. 



Saskatchawan, Drummond! Plains both east and west of the Rocky 

 Mountains in about lat. 41°, Nuttall! — Plant from 6 to 24 inches high. Ap- 

 pendages of the style lanceolate, about the length of the stigmatic portion. 

 Rays 20 to 25, pistillate, and to all appearance fertile. 



* * Scales of the involucre Uncar-laiiceolaLe, herbaceous, nco.rly equal, hose, in about 2 

 series: papp^is not very copious, as long as the corolla of the disk. 



4. A. uniflorus : somewhat woolly when young, at length glabrous; leaves 

 rigid ; the radical lanceolate, acute, sparingly and coarsely spinulose-toothed, 

 or some of them entire, petioled ; the cauline linear-lanceolate, partly clasp- 

 ing ; heads commonly solitary; involucre at length nearly glabrous ; achenia 

 silky-villous. — Donia uniflora. Hook. ! fl.. Bor.-Am. 2. p. 25, t. 124. Homo- 

 pappus uniflorus, Nutt. I. c. 



Plains of the Saskatchawan and prairies of the Rocky Mountains, Drum- 

 mond ! — Stems 5-10 inches high, from a thick caudex. Appendages of the 

 style oblong-lanceolate. Rays 25-30, fertile. 



5. A. imdoides : tomentose-wooUy throughout; the pubescence mostly 

 persistent; leaves lanceolate, acute, entire, or sparingly spinulose-serrulate ; 

 the radical tapering to the base but nearly sessile ; heads usually solitary ; 

 involucre very woolly ; achenia villous. — Homopappus (Actinaphoria) inu- 

 loides, Nutt. ! in trans. Amer. pJdl. soc. I. c. 



Moist grassy plains of the Rocky Mountains, towards the sources of the 

 Platte, Nuttall ! — Plant 3-4 inches to a foot high. Rays 40-50, Nutt. — Ap- 

 pendages of the style lanceolate-subulate. The rays are jiistillate and appa- 

 rently fertile. The species is very nearly allied to the preceding, and per- 

 haps not distinct. 



6. A. 7 al'pigenvs : caudex thick, branched ; radical leaves narrowly spa- 

 tulate or oblanceolatc, obtuse, entire, somewhat petioled, about 3-nerved, 

 glabrous; the cauline few and small, linear, 1-nerved, slightly pubescent ; 

 head solitary, terminating the short ascending scapiform stems; scales of the 

 involucre linear, rather acute, pubescent, loosely imbricated in a double 

 series; the exterior a little shorter; achenia oblong-linear, at length nearly 

 glabrous. 



VOL. II. — 31 



