258 CONTKIBUTIONS FROM THE NATIONAL, HERBARIUM. 



Flowers in lunbels; fruit a berry; leaves 1 or 2 ... . Aralia (p. 383). 

 Flower-bearing stems leafy. 



Plants hairy; corolla of distinct petals . . GERANIACEAE (p. 374). 

 Plants glabrous or nearly so; corolla of united petals. 



VALERIANACEAE (p. 413). 

 Leaves alternate, the stems leafy. 

 Corolla of united petals. 

 Capsule 3-celled ; flowers not in 1-sided racemes. 



POLEMONIACEAE (p. 396). 

 Capsule 1-celled; flowers mostly in l-sided racemes, these often 



clustered HYDROPHYLLACEAE (p. 397). 



Corolla of distinct petals, or sometimes wanting. 

 Flower shaped like that of a bean or pea; fruit a legiune. 



FAB ACE AE (p. 367). 

 Flower not like that of a bean or pea; fruit not a legume. 

 Flowers in umbels; fruit of 2 united carpels, these separating at 



maturity * APIACEAE (p. 383). 



Flowers not in umbels; fruit not of 2 carpels. 

 Petals 4; flowers in racemes; fruit a pod, this splitting into 2 parts. 

 Petals unlike, one of them spurred; leaves divided into numerous 



narrow lobes rUMARIACEAE (p. 344). 



Petals all alike, not spurred; leaves of few, mostly broad leaflets. 



Leaflets 3, attached at the end of the petiole, entire; petals 



about 1 cm. long, purplish . . CAPPARIDACEAE (p. 352). 



Leaflets more than 3, some attached along the sides of the 



petiole, usually toothed; petals smaller. 



BRASSICACEAE (p. 344). 

 Petals 5 or more or wanting; flowers not in racemes; fruit various. 

 Stamens 5 or 10; flowers white or pink. 



SAXIFRAGACEAE (p. 353). 

 Stamens 15 or more; flowers of various colors. 

 Leaves without stioules; sepals distinct; petals often absent. 



RANUNCULACEAE (p. 338). 

 Leaves with stipules; sepals more or less united ; petals present, 



ROSACEAE (p. 358). 

 A A . Leaves simple, entire or toothed, sometimes lobed but not lobed to the midrib. 

 Plants floating on or submerged in water. 



Plants very small, 1 cm. long or less, without leaves, floating and not attached. 



LEMNACEAE (p. 304). 

 Plants many times larger, with leaves, attached to the bottoms of streams or 

 lakes. 



Leaves in whorls of 6 to 12 Hippuris (p. 383). 



Leaves opposite or alternate, not whorled. 

 Leaves cordate at the base, 15 to 20 cm. wide or larger; flowers yellow, 6 



to 10 cm. broad NYMPHAEACEAE (p. 338). 



Leaves not cordate, much smaller; flowers small and green. 



Flowers in globose heads SPARGANIACEAE (p. 277). 



Flowers not in heads. 



Leaves 5 to 20 mm. long; flowers sessile in the leaf axils; leaves 

 opposite; fruit not beaked .... CALLITRICHACEAE (p. 375). 

 Leaves usually much longer; flowers in spikes, or sometimes sessile in 

 the leaf axils but the fruit then beaked. 



POTAMOGETONACEAE (p. 278). 



