154 COMPOSITiE. Astkr. 



most about half that length. Rays short, erect-spreadinc:, purple ; the disk 

 turning purple. Achenia linear-cuneiform, glabrous. — Placed by Nees at 

 the commencement of his Concinni : Dr. Lindley compares with it his A. 

 azureus, and A. turbinellus. We liave seen no specimens. 



102. A. retrojlexus (Lindl.) : stem compound-racemose; the branches 

 short and bearing single heads ; leaves linear-lanceolate, entire, very gla- 

 brous ; those of the branches linear-subulate, recurved, distant; scales of the 

 hemispherical involucre linear-lanceolate, squarrose. Lindl.! in DC. j^Todr. 

 6. p. 244. 



North America. — Disk whitish, scarcely changing. Rays blue. DC. — 

 We are uncertain whether this is described from cultivated or indigenous 

 specimens. No farther particulars are given. It is placed between A. 

 azureus and A. turbinellus. 



A. serotinus, Mill. diet. erl. Maiiyji, (1797,) founded on the A. foliis oblongis acu- 

 tis basi latioribus semi-amplexicaiilibus, caule ramose, floribus temiinalibus plerum- 

 que solitariis (Late blue shrubby Starwort of John Tradescant, commonly called 

 Michaelmas Daisy'), of the earlier editions, is anterior to the A. serotinus of Willde- 

 now, but is not cited by that author or by succeeding writers. It is said to have 

 been brovight from Virginia, and to bear "pretty large flowers, which are of a very 

 pale bluish color, tending to white." 



§ 4. Scales of the involucre nearly equal, loose, narrow, scarcely or slightly 

 imbricated, more or less herbaceous : receptacle naked, scrobiculate : appen- 

 dages of the style triangular, short : pappus of cajnllary bristles : rays 

 numerous : stems often low and simple, bearing solitary or feto large heads. 

 — Oritrophium, Kunth, excl. spec. ? (Ast. Alpigeni, Nees, DC.) 



103. A. alpinus (Linn.) : pubescent or hairy; stem bearing a single head; 

 leaves entire, 3-nerved or tripli-nerved, obtuse ; the radical ones spatulate, 

 the cauline lanceolate ; scales of the involucre loose, about the length of the 

 disk, oblong-linear, obtuse or obtusish, ciliate and pubescent. — Linn. spec. 2. 

 p. 872; Jacq. Jl. Austr. t. 88; Bot. mag. t. 199; Nees, Ast. p. 26; Hook..' 

 fl. Bor.-Am. 2. p. 6 ; DC ! prodr. 5. p. 227. 



On the higher Rocky Mountains, in lat. 54°, Drummond ! — Heads, with 

 the blue rays, 1^-2 inches in diameter, showy. Radical leaves petioled. — 

 The American plant resembles Siberian forms. 



IQA^. A. pygm/eus (Lindl.): villous; stem bearing a single head; leaves 

 at length nearly glabrous, obtuse, entire, 1-nerved or obscurely 3-nerved ; 

 the radical ones spatulate-oblong or oblanceolate ; the cauline lanceolate; 

 scales of the very villous involucre linear, obtuse, squarrose-spreading. — 

 Lindl. ! in Hook. Jl. Bor -Am,. 2. p. 6, c^ in DC. prodr. 5. p. 228. 



Arctic sea-coa.st, Richardson! — Plant about 2 inches high. Head large 

 for the size of the plant ; the rays scarcely twice the length of the involucre. 

 — Smaller specimens of A. intermedins, Turcz.! (A. Argunensis, fide DC.) 

 scarcely differ from this species, except in their longer rays and more hirsute 

 pubescence. 



105. A. Andinus (Nutt.) : rhizoma slender and creeping ; stems several, 

 decumbent, above pubescent, mostly bearing a single head ; leaves glabrous, 

 entire; the radical spatulate or somewhat lanceolate; the cauline nearly 

 linear, acute, usually wider at the base and clasping; .scales of the involucre 

 linear, nearly glabrous, ciliate, mostly acute ; rays numerous, rather long ; 

 achenia nearly glabrous. — Nutt. ! in trans. Amer. p>hil. soc. (n. ser.) 7. p. 290. 



Rocky Mountains at Thornberg's Ridge, near the line of perpetual snow 

 in lat. 42°, about 10,000 feet above the level of the sea, Nuitall! — Root wiry 



