WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 643 
Tribe VI. HELENIEAE. 
Plant tissues, especially the leaves and involucres, with oil glands. 
Rays wanting; plants tall, usually about a meter high.83. PoropHyLivum (p. 714). 
Rays present; plants mostly less than 30 cm. high. 
Pappus wholly of capillary bristles. 
Stems woody almost throughout.......... 84, CHRYSACTINIA (p. 714). 
Stems herbaceous; annuals....-.........-.-.---- 85. Pectis (p. 714). 
Pappus at least in part of pales. 
Bracts of the involucre distinct. 
Perennials; leaves alternate; flowers flesh-eolored. 
86. Nicot.etia (p. 715), 
Annuals; leaves opposite; flowers yellow...... 85, Prcris (p. 714), 
Bracts more or less united. 
Bracts united only at the base.............. 87. BorBera (p. 715). 
Bracts united for half their length or more. 
Involucres cylindric; achenes compressed, not striate; annual. 
88. TAGETES (p. 716), 
Involucres campanulate; achenes terete, striate; annuals or 
perennials. 
Low shrub; leaves all entire; heads sessile or nearly so. 
89. ACIPHYLLAEA (p. 716). 
Herbs; leaves mostly pinnatifid; heads slender-peduncled. 
90. THYMOPHYLLA (p. 716). 
Plant tissues without oil-glands. 
Rays persistent; plants more or less woolly. 
- Pappus present; rays 3 to 4; heads small, corymbose. 
91. PstLostropHeE (p. 718). 
Pappus none; rays 5 to many; heads large, solitary at the ends of the branches. 
92. BarLeya (p. 718). 
Rays not persistent; plants with various pubescence. 
Achenes flat. 
Pappus of about 20 bristles; plants scapose.....93. LAPHAMIA (p. 719). 
Pappus a low crown or of | or 2 awns; plants not scapose, 
Pappus a lacerate-ciliate crown with sometimes a pair of awns; tall 
plant 50 cm. high or more with triangular-hastate leaves. 
94. PERICOME (p. 719). 
Pappus of 2 awns; low plants seldom more than 10 cm, high, with 
pinnately parted leaves..........-.-. 95, PERITYLE (p. 719). 
Achenes angled or terete, never flat. 
Receptacle chaffy. 
Stems woody; leaves fleshy; pappus of 20 to 25 bristles. 
96. CLaprra (p. 719). 
Stems herbaceous; leaves not fleshy; pappus of 5 to 10 scarious palee. 
97. GAILLARDIA (p. 719). 
Receptacle naked. 
Bracts of the involucre pale or colored, at least the margins and tips 
scarious. 
Involucres 3 to 9-flowered............98. ScaKunrta (p. 720). 
Involucres 12 to many-flowered. 
Rays wanting...............-- 99. HymENoparrus (p. 720). 
