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FLORA OF THE DISTRICT OF COLUMBIA. 49 



Ovary superior. 

 Ovary simple. 



Flowers papilionaceous FABACEAE (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 FTJMABIACEAE (p. 163). 



Petals 5; stamens 5 VIOLACEAE (p. 206). 



Corolla regular or nearly so. 

 Placentae central. 



Petals inserted on the throat of the calyx LYTHBACEAE (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. 



DBOSEBACEAE (p. 170) . 

 Leaves not conspicuously glandular. 



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



Petals 4; stamens G; plants not climbing. 

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



Raphanus (p. 170). 



Pod dehiscent, many-seeded; leaves palmately compound. 



CAPPABEDACEAE (p. 170). 



DD. OVARY 2-SEVERAL-CELLED. 



Flowers irregular. 



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



Flowers not spurred ; leaves entire POL YG ALACE AE (p . 193) . 



Flowera regular or nearly so. 



Plants without chlorophyll MONOTBOPACE AE (p. 221) . 



Plants with chlorophyll. 

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



BBASSICACEAE (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 GEBANIACEAE (p. 190). 



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

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



LINACEAE (p. 192). 



Ovules, and usually seeds, several in each cell. 



Leaves 3-foliolate OZALIDACEAE (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 PYBOLACEAE (p. 220). 



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



69289—19 4 



