FLORA OF THE DISTRICT OF COLUMBIA. 49 



Ovary superior. 

 Ovary simple. 



Flowers papilionaceous FAB ACEAE (p. 181) . 



Flowers not papilionaceous CAESALPINIACEAE (p. 180). 



Ovary compound (the cells, placentae, styles, or stigmas more than 1). 



D, DD. 

 D. OVARY 1-CELLED. 



Corolla irregular. 



Petals 4; stamens 6 FUMARIACEAE (p. 163). 



Petals5; stamens 5 VIOLACEAE (p. 206). 



Corolla regular or nearly so. 

 Placentse central. 



Petals inserted on the throat of the calyx LYTHRACEAE (p. 211). 



Petals not inserted on the calyx. 



Sepals distinct; petals not stalked ALSINACEAE (p. 151). 



Sepals united ; petals stalked SILENACEAE (p. 153). 



Placentae on the sides of the ovary. 

 Leaves with conspicuous stalked glands. Low bog plants. 



DROSERACEAE (p. 170) . 

 Leaves not conspicuously glandular. 



Petals 5; plants climbing by tendrils PASSIFLORACEAE (p. 211) . 



Petals 4; stamens 6; plants not climbing. 

 Pod beaked, indehiscent, 2-3-seeded; leaves pinnately lobed. 



Raphanus (p. 170). 

 Pod dehiscent, many -seeded; leaves palmately compound. 



CAPP ARID ACEAE (p. 170). 



DD. OVARY 2-SEVERAL-CELLED. 



Flowers irregular. 



Flowers spurred ; leaves crenate-toothed IMPATIENTACEAE (p. 201) . 



Flowers Bot spurred; leaves entire POLYGALACEAE (p. 193). 



Flowers regular or nearly so. 



Plants without chlorophyll MONOTROPACE AE (p. 221) . 



Plants with chlorophyll. 

 Stamens 6 (sometimes 2 in Lepidium); petals 4. Flowers usually in racemes. 



BRASSICACEAE (p. 163). 

 Stamens as many or twice as many as the petals. 

 Ovules 1 or 2 in each cell. 

 Ovary deeply lobed; pod long-beaked, dehiscing elastically from the base; 



leaves lobed or divided GERANIACEAE (p. 190). 



Ovary not lobed, appearing 10-celled from partitions between the seeds, not 

 long-beaked nor dehiscing from the apex; leaves entire. 



LINAGE AE (p. 192). 

 Ovules, and usually seeds, several in each cell. 



Leaves 3-foliolate OXALIDACEAE (p. 191) . 



Leaves simple. 

 Stipules present between opposite leaves. A low marsh annual. 



ELATINACEAE (p. 205). 

 Stipules none when the leaves are opposite. 



Leaves alternate; foliage evergreen PYROLACEAE (p. 220). 



Leaves opposite; foliage not evergreen LYTHRACEAE (p. 211). 



69289—19 4 



