Erigerox. composite. 169 



Summits of the Rocky Mountains, between lat. 52° and 56°, Drummond ! 

 — Scapes about 3 inches high. Head much larger than in E. uniflorum ; 

 the rays white or rarely tinged with purple. 



* * Somewhat cecspitose {siibalpirie) species : stems mostly short, leafy, bearing one or 

 few lieads: leaves entire : the inner series of pistillate flowers often filiform-tubular, 

 truncate. (Trimorphaea, Cass.) 



9. E. unifloruw, {Liinn.) : stem short, bearing a single head; leaves hir- 

 sute ; the cauline lanceolate or linear ; the radical ones spatulate and be- 

 coming somewhat glabrous ; pistillate flowers nearly all ligulate ; the rays 

 somewhat erect, scarcely twice the length of tlie very woolly involucre. — 

 Linn..' spec. 2. p. 864, c^.^. Lapp. <. 9, /. 3; Hook. ! fl. Bor.-Am. 2. p. 



17. E. alpinum, Pursh, fl. 2. p. 532. E. alpinum j. DC. ! jrrodr. 5. p. 

 290. E. pulchellum 13. Unalaschkense, DC. I. c. p. 287. E. humile, 

 Graham, in Edinb. phil, jour. 1828. p. 175 ? 



Arctic shore and islands from Greenland to Behring's Straits and Una- 

 laschka ! Summits of the Kocky Mountains, Dru7n7nond ! Labrador! — The 

 involucre and its dense woolly covering are usually purple in the American 

 specimens, as they frequently are in the European. There .are minute 

 slightly squamellate setae mixed with the longer bristles of the pappus, 

 which are sometimes so copious as to form an indistinct outer series, in this 

 species, and also in E. alpinum and E. grandiflorum. 



10. E. grandifl,orum (Hook.) : very hirsute ; caudex thick ; stems short, 

 bearing a single head ; radical leaves oblong-spatulate ; the cauline oval- 

 lanceolate; pistillate flowers all ligulate; the rays spreading, twice the 

 length of the very densely woolly involucre. — Hook. ! fl. Bor.-Am. 2. p. 



18, t. 123. 



Summits of the Rocky Mountains, Drummond ! — Stems 4-6 inches high. 

 Heads very large for the size of the plant. Scales of the involucre with pur- 

 plish and naked tips ; the woolly covering white. Rays white or purple. — 

 Can this also be the E. grandiflorum of Hoppe ? 



11. E. alpinum (Linn.) : somewhat hirsute ; stem somewhat elongated, 

 bearing one or few heads ; leaves lanceolate ; the radical ones spatulate, ta- 

 pering into a petiole ; the inner pistillate flowers numerous, tubular-filiform, 

 truncate; the rays spreading, twice the length of the hirsute involucre; pap- 

 pus of the disk as long as the corolla. — Linn. ! spec. 2. p. 864 ; Engl. hot. 

 t. 464 ; Hook. ! fl. Bor.-Am. 2. _p. 18 ; DC. ! prodr. 5. p. 291. (a.) 



/3. leaves narrower ; branches elongated. Hook. ! I. c. 



J. tall (about a foot high) ; heads several. Hook. ! I. c. 



Rocky Mountains, Drummond ! — Rays purple. Apparently a very rare 

 species in this country. — The exterior pappus, if it may so be called, in this 

 species was observed by Cassini {Diet. sci. nat. 37, p. 485), who therefore 

 referred it to his genus Stenactis. 



12. E. glahratum (Hoppe) : almost glabrous ; stem tall, simple ; radical 

 leaves spatulate ; the cauline linear-lanceolate ; raceme terminal, many- 

 flowered ; peduncles elongated, scarcely corymbose, simple or branched ; 

 scales of the small involucre very narrow [pistillate flowers mostly or wholly 

 ligulate] ; rays inconspicuous, immersed in the copious pappus. Hook.— 

 '■'Hoppe Sf Hornsch. cent. ; Bl. & Fing. comp. fl. Ger?n. 2. p. 364"; Koch, 

 fl. Germ. S^- Helv. p. 354; Hook.! fl. Bor.-Am. 2. p. 18. E. alpinum /?. 

 ramosum, IVahi. fl. Lapp. p. 207. E. alpinum /3. DC. I. c. E. racemo- 

 sum, Nutt. ! in trans. Amer. phil. soc. [n. ser.) 7. p. 312. 



p. peduncles contracted. — E. racemosum /3. angustifoliura, Nutt.! I. c. 

 Hudson's Bay to the Rocky Mountains, and from Saskatchawan to Fort 



VOL. II.-22 



