1618 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Phyllaries acute or acuminate. 

 Involucre 1.2 to 1.8 cm. high. 



Petioles about 4 mm. long; involucre about 7-seriate 5. L. pringlei. 



Petioles about 2 cm. long; involucre about 4-seriate 6. L. klattii. 



Involucre much shorter. 



Phyllaries silky-pubescent 2. L. sericolepis . 



Phyllaries not silky-pubescent. 



Phyllaries glandular-hispidulous; pedicels stipitate-glandular. 



3. L. adenotrichum. 

 Phyllaries not glandular-hispidulous; pedicels not stipitate-glandular. 



4. L. caducifolium 

 Heads radiate. 



Heads few, large, the involucre 2 to 4 cm. thick 7. L. andrieuxii. 



Heads numerous, much smaller, the involucre less than 1 cm. thick. 



Phyllaries attenuate; petioles wing-margined throughout- .8. L. bourgeaui. 

 Phyllaries obtuse; petioles margined only at apex if at all. 

 Achenes densely hispidulous. 



Involucre about 6 mm. high 9. L. andromachioides. 



Involucre about 11 mm. high 10. L. deppeanum. 



Achenes glabrous or hispidulous only at apex. 



Involucre about 4-seriate; pedicels 1 to 1.5 cm. long.. 11. L. discolor. 

 Involucre 2-seriate; pedicels 2.5 to 5 cm. long 12, L. platylepis. 



1. Liabum glabrum Hemsl. Biol. Centr. Amer. Bot. 2: 232. 1881. 



Known only from the vicinity of the type locality, Iturbide, near Cuernavaca, 

 Morelos. 



Shrub, up to 6.5 meters high; branches glabrous or early glabrate; leaves 

 slender-petioled, the blades rhombic-ovate or lance-ovate, 9 to 15 cm. long, 3 

 to 4 cm. wide, acuminate, .serrulate, cuneate at base, green above, thinly arach- 

 noid and quickly glabrate beneath; heads numerous, thyrsoid-panicled; involucre 

 about 8 mm. high; achenes sparsely glandular. 



la. Liabum glabrum hypoleucum Greenm. Proc. Amer. Acad. 32: 294. 1897. 



Jalisco and Morelos; Oaxaca (?); tj'pe from Guadalajara, Jalisco. Guatemala 

 and El Salvador. 



Leaves permanently arachnoid-tomentose beneath; achenes often glabrous. 

 "Palo de agua" (Oaxaca); "espinillo," "palo de San Nicolas," "papeliUo" 

 (El Salvador). 



2. Liabum sericolepis Hemsl. Biol. Centr. Amer. Bot. 2: 232. 1881. 

 Known only from the tj^pe locality, Valley of C6rdoba, Veracruz. 



Shrub, scandent (?); branches glabrescent; leaf blades ovate-oblong, 5 to 7.5 

 cm. long, green above, white-tomentose beneath; heads numerous, densely 

 cymose-panicled; involucre 4 or 5-seriate; immature achenes setulose at apex. 

 (Description compiled.) 



3. Liabum adenotrichum Greenm. Field Mus. Bot. 2: 439. 1912. 



Known only from the type locality, Cerro de Frujano, Distrito del Centro 

 Oaxaca. 



Shrub, 3 to 4 meters high; branches floccose-tomentose, glabrate; leaf blades 

 ovate, 6 to 13 cm. long, 2 to 7.5 cm. wide, acuminate, cuneate at base, above 

 arachnoid-tomentose, glabrate, beneath densely white-lanate; inner phyllaries 

 acute or obtuse, the outer acute; achenes hirsute and glandular. (Description 

 compiled.) 



4. Liabum caducifolium Robins. & Bartlett, Proc. Amer. Acad. 43: 59. 1907. 

 Known onlj^ from the tj^pe locality, near Acapulco, Guerrero. 



Shrub, leafless at flowering time (the leaves unknown); branches glabrate; 

 heads numerous, cymose-panicled, short-pediceled; involucre 5 mm. higli; 

 immature achenes hispidulous; pappus fulvescent. 



