174 
Series IT. LABIATIFLORA. Corollas of all or only of the perfect 
flowers bilabiate (except in no. 114). 
Tribe X. Muristacka, Receptacle naked: anthers conspicuously tailed at base: 
style-branches short, smooth, not appendaged: leaves alternate. 
* Corollas almost or quite regularly and deeply 5-cleft into linear lobes: shrubs. 
114. Gochnatia. Heads fasciculately-paniculate or cymose: involucre of dry or 
coriaceous imbricated bracts: achenes oblong, silky-villous: pappus of copious rigid 
capillary bristles. 
* * Corollas either all bilabiate, or marginal ones simply ligulate. 
+ Heads radiate, the ray-flowers female and simply ligulate, 
115. Chaptalia. Involucre of narrow appressed-imbricated bracts: achenes ob- 
long or fusiform, 5-nerved, attenuate or beaked at apex ,bearing a copious pappus of 
very soft and fine capillary bristles: scapigerous and monocephalous herbs. 
++ All the corollas bilabiate. 
116. Perezia. Involucral bracts imbricated in few to several series: achenes clon- 
gated-oblong, sometimes narrowed at apex, but not beaked: pappus of copious capil- 
lary scabrous bristles, rather rigid or soft: flowers never yellow. 
117. Trixis. Proper involuecral bracts 8 to 12, equal in a single series, or in two 
unequal series, little if at all imbricated: achenes more slender, with a tapering or 
beaked summit: pappus soft: flowers yellow. 
Series Ill, LIGULIFLORA. Corollas all ligulate and the flowers 
hermaphrodite. 
Tribe XI. Crcnortaceaz. Receptacle naked or chaffy: anthers not caudate: style- 
branches filiform, naked: herbs with milky juice and alternate leaves. 
* Pappus none: receptacle naked. 
118. Apogon. Achenes terete, obovoid, rounded at summit, 10-ribbed, rarely an ob- 
solete vestige of pappus: low annuals. 
* * Pappus of scales and bristles or plumose: receptacle naked. 
119. Krigia. Involucre simple, not calyculate: pappus of both scales and bristles, 
flowers yellow. 
120. Stephanomeria. Involucre double, calyculate: pappus plumose: flowers 
pink or rose-color. 
* * * Pappus composed entirely of capillary bristles, not plumose, 
+ Receptacle chaffy: corollas rose-color. 
121. Pinaropappus. Involucral bracts imbricated, the outer successively shorter: 
chaff attenuate-linear: achenes slender, terete, 10 to 15-ribbed, tapering from base 
into a short slender beak. 
++ Receptacle naked. 
++ Achenes not flattened, columnar or terete. 
= Achenes not beaked. 
122. Hieracium. Flowers yellow or orange: achenes short, oblong, or columnar: 
involucre imbricated: pappus tawny. 
123. Lygodesmia. Flowers rose-purple: achenes long and tapering: involucre 
cylindrical, in a single series: pappus white, 
= = Achenes beaked: flowers yellow: involucre calyculate. 
124. Taraxacum. Scapose: pappus white and copious. 
125. Pyrrhopappus. Scapose or branched: pappus reddish, the base surrounded 
by a soft villous ring. 
