32 CONTRIBUTIONS FROM THJi; NATIONAL HERBARIUM. 



F. 



Plants with simple leaves, acaulescent or the stems underground, the flowering 

 stems naked or bearing a single leaf or whorl of leaves subtending the inflorescence. 



Leaves pitcher-like or covered with long gland-bearing hairs, purplish. Flowers reg- 

 ular, with 5 petals; fruit a capsule. 

 Leaves pitcher-like; flowers solitary on long scapes. . SARRACENIACEAE (p. 170). 

 Leaves flat, covered with gland-bearing hairs; flowers in racemes. 



DROSERACEAE (p. 170). 

 Leaves neither pitcher-like nor covered with gland-bearing hairs. 

 Flowers sessile in dense heads or spikes. • ' 



Flowers in heads. 



Leaves toothed or lobed; flowers yellow CICHORIACEAE (p. 263). 



Leaves entire, narrow; flowers yellow or white. 



Leaves 2-ranked; flowers yellow XYRIDACEAE (p. 115). 



Leaves not 2-ranked; flowers whitish ERIOCATJLACEAE (p. 115). 



Flowers in spikes. 



Spikes twisted; leaves often wanting; flowers white Ibidium (p. 130). 



Spikes not twisted; leaves always present; flowers not white. 



Leaves deeply cordate at the base, broad, not ribbed, glabrous; flowers blue, 



showy; fruit 1-seeded Pontederia (p. 116). 



Leaves slightly or not at all cordate, broad and ribbed or linear, often pubes- 

 cent; flowers small, greenish; fruit with 2 or more seeds. 



PLANTAGINACEAE (p. 256). 



Flowers not sessile in dense heads or spikes, sometimes in dense racemes, but then 

 pediceled. 

 Scapes with more than 1 flower. 



Leaves terete, fleshy. Flowers pink; fruit a capsule Talinum (p. 150). 



Leaves flat, not fleshy. 



Corolla very irregular. Leaves parallel-veined. .ORCHIDACEAE (p. 127). 

 Corolla regular. 

 Flowers or branches of the inflorescence forming several or many whorls; 

 fruit a head of numerous achenes. Petals 3, white; leaves usually 



cordate or hastate ALISMACEAE (p. 64). 



Flowers not whorled; fruit a capsule. 



Leaves evidently parallel-veined, linear or very narrow; petals 3. 



Leaves 2-ranked. Flowers usually blue ERIDACEAE (p. 126). 



Leaves not 2-ranked. 



Flowers 4 or fewer, yellow or white; leaves sometimes pubescent. 



AMARYLLIDACEAE (p. 125). 

 Flowers numerous, or, if few, orange; leaves glabrous. 



LILIACEAE (p. 120). 

 Leaves net-veined, oblong to rounded; petals or corolla lobes 5. 

 Blades of the leav«s very pubescent, conspicuously toothed; flowers 

 in cymes, wliite, the petals distinct; capsule cleft nearly to the 



base Saxifraga (p. 172). 



Blades of the leaves glabrous, entire or very shallowly toothed; flowers 

 not in cymes; capsule not cleft. 

 Flowers in umbels; corolla gamopetalous, reflexed, rose-colored. 



leaves not evergreen Dodecatheon (p. 227) . 



Flowers in racemes; petals distinct, white, greenish, or pink, spread- 

 ing; leaves evergreen PYROLACEAE (p. 220). 



Scapes 1-flowered. 

 Leaves toothed or lobed. Petals distinct or none. 



Fruit a head of achenes; leaves 3-lobed, the lobes entire or merely crenate; 

 flowers yellow, bluish, or white; petals sometimes wanting, the sepals 

 then petal-like RANTJNCULACEAE (p. 156). 



