212 



Descriptive Flora 



Page 



long, flowers about 1 y 4" 



across , Keerlia — 221 



(2) Basal leaves over 



long . . Aster— 222-3 



s. Rays flowers none, 

 o. Flower stalk with sticky 



secretions Polypteris — 236 



p. Flower stalks not sticky. 



(1) Leaves linear. 



o. Flowers In a spike Lacinaria — 215 



p. Flowers in a flat-top- 

 ped cluster Vernonia — 214 



(2) Leaves broader than 

 linear, toothed. 



o. Flowers in broad-top- 

 ped clusters. 



(1) Individual flowers 



showy, about %" 

 across, bright pur- 

 ple Vernonia — 214 



(2) Individual flowers 

 not showy, about 

 % " across, pale 



purple Pluchea — 225 



y. Leaves with more than 1 vein at base, 

 a. Flowers yellow or orange, 

 m. Shrubs growing in pockets of 



limestone walls and boulders Laphamia — 237 



n. Plants not shrubs. 



r. Leaf-stalks with toothed append- 

 age at base. 



(1) Bracts of involucre 4, large Tetragonotheca— 228 



(2) Bracts of involucre more than 



4 Ximenesia — 232 



s. Leaf-stalks not appendaged. 



(a) Leaves entire, milky- veined Amblyolepis— 238 



(b) Leaves not milky veined. 

 (1) Stems rough. 



o. Disk dark brown, heads 2 — 



4" across Helianthus— 231 



p. Disk paler, heads 1 — 2" 



