262 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves thick, evergreen, usually finely toothed; stamens 

 10; capsule 5-celled ; flowers one or several on each stem. 



PYROLACEAE (p. 388). 

 Leaves thin, not evergreen, entire; stamens 5, with clusters 

 of sterile stamens between them; flower one on each stem. 

 PARNASSIACEAE (p. 353). 

 CC. Stems leafy, usually with 2 or more leaves. 

 Flowers in heads surrounded by an involucre of bracts, the whole resembling 

 a single flower (goldenrod, aster, dandelion, etc.). 

 Juice milky; flowers all with strap-shaped (ray) corollas. 



CICHORIACEAE (p. 414). 

 Juice not milky; only the outer flowers of the head, if any, with strap-shaped 



corollas ASTERACEAE (p. 419). 



Flowers not in heads surrounded by bracts. 

 Corolla of united petals. 



Stems creeping, not twining; corolla about 3 mm. long; fruit fleshy. 



Gaultheria (p. 391). 

 Stems erect or rarely prostrate and trailing; corolla usually larger; fruit dry. 

 Fruit of 4 nutlets; leaves entire; corolla regular. 



BORAGINACEAE (p. 399). 

 Fruit a capsule; leaves entire, toothed , or lobed ; corolla regular or 2-lipped . 

 Corolla 2-lipped or saucer-shaped . . SCROPHULARIACEAE (p. 403). 

 Corolla neither 2-lipped nor saucer-shaped. 

 Stamens protruding from the corolla; leaves entire or lobed. 



Phacelia (p. 398), 

 Stamens shorter than the corolla; leaves entire or toothed. 

 Leaves with 2 lobes at base, oblong or ovate; seeds 4. 



CONVOLVULACEAE (p. 396). 

 Leaves without lobes, mostly linear; seeds 3 or many. 

 Leaves entire; corolla tubular, about 1 cm. long, pink or pale 



purple, not drooping Collomia (p. 397). 



Leaves finely toothed; corolla bell-shaped, 15 to 20 cm. long, 

 blue or bluish purple, drooping. 



CAMPANULACEAE (p. 414). 

 Corolla of distinct petals or often wanting, the calyx sometimes corolla-like. 

 Petals none, the calyx sometimes corolla-like. 

 Calyx inserted on the top of the ovary, white; leaves entire. 

 ' SANTALACEAE (p. 326). 



Calyx not inserted on the top of the ovary, variously colored; leaves 

 entire, toothed, or lobed. 

 Fruit a head of numerous hairy achenes; sepals petal-like. 



Anemone (p. 343). 

 Fruit a capsule or a single achene; sepals various. 

 Fruit containing 2 or more seeds; leaves toothed or lobed. 



Flowers in spikes; leaves woolly Synthyris (p. 407). 



Flowers in racemes; leaves not woolly Lepidium(p. 345). 



Fruit 1-seeded; leaves entire, toothed, or lobed. 

 Leaves with sheathing stipules; fruit often 3-angled. 



POLYGONACEAE (p. 326). 



Leaves without stipules; fruit never 3-angled. 



Fruit opening by a lid; bracts of the inflorescence with sharp 



spiny tips; leaves entire . . . AMARANTHACEAE (p. 332). 



Fruit not opening by a lid; bractsrarely with sharp tips; leaves 



entire, toothed, or lobed . . CHENOPODXACEAE (p. 330). 



