8Q2 



COMPOSITAE (composite FAMILY) 



57. A. mbulatus. 



58. 



A. angiiatus. 

 A.Jrondo8U8. 



56. A. 



1. A.pahjbdosu^, 



Rays 6 mm. or less long ; leaves slightly serrate . . 41. A. Trndescanii. 

 Rays longer ; leaves entire . . (42) A. paniculaius, v. belHdi^orns. 

 Branches divaricate ; small heads in 1-sided racemes . 39. A. mmineus. 



Branches ascending, terminated by solitary heads (39) A. mmineue, v, saxatilis. 

 E^s violet or roae-pink (exceptionally white). 

 Leaves at most 4.6 cm. long, becoming revolute . . 55. A. n&moraUs. 



Leaves longer, plane 44. A.jimceua. 



V Involucre more than 5 mm. high Y. 

 Y. Bracts with definite firm subulate tips ... .32.-4. polyphyllus. 



Y. Bracts without firm subulate tips Z. 

 Z. Leaves at, most 4.5 cm, long. 



Stems many, rigid, from a woody caudex ; bracts firm, the 



inner blunt ; rays blue-violet 62. A. Unm'iifolius. 



Stem single, from a slender rootstock ; bracts thin, linear- 

 attenuate; rays rose-pink 55. ^. nemoralie. 



Z, Leaves longer a. 

 a. Annuals, with inconspicuous rays. 



Bracts definitely imbricated, linear or linear-subulate 

 Bracts subequal, the outer foliaceous. 

 Leaves linear-attenuate ; rays shorter than the style 

 Leaves Hnear-oblanceolate to spatulate ; rays longer than 

 the style ... 

 «.. Perennials, with mostly couspicuoas rays b, 

 h. Bracts firm, lanceolate. 



Bracts unequal, regularly imbricated, not foliaceous 

 Bracts subequal or imbricated, with spreading foliaceous 



tips , . . . . 



b. Bracts thin, linear or linear -lanceolate. 



Bracts with conspicuous elliptic or subrhombic green tips. 

 Heads terminating minutely foliose-bracteolate brancn- 



letB 38. .4. dumoaus. 



Heads paniculate, or if few on leafy (not minutely 



foliose-bracteolate) branches . . .48.-4. salimfoUus* 



Bracts without conspicuous colored tips. 

 Bays white ; bracts very narrowly linear-attenuate, 



regularly imbricated, 4-6 mm. long (42) A. panicitlatus, v. bellidijlorus. 

 Eays violet or rose-pink ; bracts linear-lanceolate, less 



definitely imbricated, mostly longer . . .44. A.Junceits. 

 v. Stem conspicuously pubescent. 



Involucral bracts (or at least the outer ones) bristly-ciliate. 

 Leaves crowded, rigid ; rays white (rarely purple-tinged). 



Heads 5-6 mm. high , 86. ^. mulUflorua. 



Heads 7-9 mm. high . 37.-4. commutatus. 



Leaves not rigid ; rays blue 35. A. amefk/ysHnus. 



Involucral bracts not bristly-ciliate. 

 Bracts with firm subulate tips ; short rays usually white. 

 Involucre hemispherical or campanulate, as broad as high '.38) A. ericoides^ v. mllomm. 

 Involucre turbinate, narrower than high . . (S4) A. depauperattts, v. parviceps. 

 Bracts thin, linear-attenuate, without firm subulate ttps ; stem 



puberulent; long rays violet or rose-pink . . , .55. A, nemoralis. 

 T. Stem-leaves lanceolate or broader c. 



ti. Heads in flat-topped corymbs ; rays white or whitish (not blue or violet) . 



Leaves rigid, linear-lanceolate ; pappus simple . . , . 53. ^. ptcrmicotdes^ 



Leaves not rigid, broader ; pappus double. 

 Involucre 3-4.5 mm. high ; leaves lanceolate to ovate . 

 Involucre 6-7 mm. high ; leaves obovate to oblong 

 c. Heads paniculate or racemose d. 

 d. Stems glabrous or essentially so e. 

 e. Involucre 5 mm. or less high. 



Bracts with definite firm subulate tips .... * 

 Bracts without firm subulate tips. 

 Heads in more or less 1-slded racemes. 

 Leaves narrowly lanceolate, scarcely serrate ; bracts lint-''- 



attenuate 



Leaves broader, serrate; bracts with the midrib dfiatec' 

 upward and rather conspicuous 

 Heads on ascending-paniculate branches. 

 Bracts linear-attenuate. 

 Heads (Including rays) 1-1.5 cm. broad ; bracts verj 



slender and green • »at • • • • - 41. 

 Heads larger ; bracts green chiefly at tip . . , . 42. 

 Bracts broad-linear or linear-oblong, with conspicuous 



elliptic or subrhombic green tips . . . . 48. ^. saUcifoliua. 



e. Involucre more than 5 mm. high /. 

 /. Bracts with definite flrm subulate tips , . . . .32, A. polyphyUua. 

 f. Bracts without firm subulate tips g. 

 g. Leaves on branchlets reduced to rigid subulate bracts. 



Perennial; involucre 9 mm. or more high, of firm closely 



Imbricated bluntlsh bracts 28. /I. turhinelhia 



50. A. wnbellatus. 



51. A. zTi^rmvs. 



A. erieoides. 



39. A. 'oimineus. 



40. A, laterifiorita. 



A. Tradeacanii. 

 A. 



