STANDLEY TREES AND SHRUBS OP MEXICO 1529 



2. Rhysolepis palmeri (A. Gray) Blake, Contr. Gray Herb. n. ser. 52: 37. 

 1917. 



Viguiera palmeri A. Gray in S. Wats. Proc. Amer. Acad. 22: 427. 1887. 



Jalisco; type from Rio Blanco. 



Leaf blades 4 to 10.5 cm. long, 1.3 to 3 cm. wide; phyllaries all squarrose- 

 tipped, the outer with lance-linear foliaceous tips up to 2.5 cm. long. 



52. MONTANOA Cervant. in Llave & Lex. Nov. Veg. Descr. 2: 11. 1825. 

 RBFERE^fCE: Robinson & Greenman, Proc. Amer. Acad. 34: 508-521. 1899. 

 Shrubs or trees; leaves chiefly opposite, usually ovate, sometimes lobed or 

 coarsely pinnatifid; heads white, radiate, rarely discoid, usually numerous; outer 

 phyllaries about 5 to 7, usually linear to oblong; rays neutral; pales in fruit 

 accrescent, usually scarious, often spinescent-tipped, including and greatly 

 surpassing the obovoid, thickened, epappose achenes. 



The genus was named by Cervantes in honor of Don Luis Montana, native of 

 Puebla, a distinguished physician and naturalist. 



The name "cerbatana" is reported for some unidentified species of the genus. 

 In Central America this same name is sometimes applied to species of Verbesina 

 because of the fact that the hollow stems are employed by boys for making 

 popguns (cerbatanas) . 

 Rays none; heads 3 or 4-flowered. 



Leaves suborbicular, rusty-tomentose beneath 1. M. hemsleyana. 



Leaves elliptic-lanceolate to oval-ovate, quickly glabrate beneath_2. M. rekoi. 

 Rays present; heads with more numerous flowers. 



Heads very large, 4.5 to 8 cm. wide; leaves deeply pinnatifid. 



Petioles broadly winged to the very base 29. M. grandiflora. 



Petioles incompletely or not at all winged. 



Leaves permanently canescent-tomentose beneath 30. M. speciosa. 



Leaves soon green and merely puberulent beneath_.31. M. pyramidata. 

 Heads smaller, 4.5 (rarely 5) cm. wide or less; leaves often merely serrate. 

 Heads very small, 16 mm. wide or less, the rays 2 to 5; pales denseh' silky- 

 villous. 

 Leaves truncate or subcordate at base. 



Leaves deltoid-ovate, about as wide as long 3, M. floribunda. 



Leaves triangular-ovate, much longer than wide 4. M. tomentosa. 



Leaves cuneate to acute at base. 

 Leaves distinctly 3 or 5-lobed. 



Phyllaries in anthesis 5 to 6 mm. long 9. M. palmeri. 



Phyllaries in anthesis 3 to 4 mm. long. 



Leaves about one-half as wide as long 7. M. myriocephala. 



Leaves about three-fourths as wide as long._.8. M. xanthiifolia. 

 Leaves unlobed. 



Phyllaries at anthesis 2.5 to 4 mm. long. 



Leaves 2 to 7 cm. wide, on petioles 1 cm. long 5. M. seieriana. 



Leaves 1.8 to 2 cm. wide, on winged petioles. -6. M. microcephala. 

 Phyllaries at anthesis 4.5 to G mm. long. 



Larger leaves rhombic-ovate, 7 to 8 cm. wide 9. M. palmeri. 



Larger leaves ovate, 2 to 5 cm. wide 10. M. rosei. 



Heads medium-sized, the rays 7 to 10; pales from rather densely villous to 

 nearly glabrous, not silky. 

 Phyllaries about 10 mm. long. 



Phyllaries spatulate-obovate. -. ...ll. M. pringlei. 



