FLORA OF THE DISTRICT OF COLUMBIA. 39 



Flowers not subtended by bracts, the sepals not awn-pointed; fruit 

 indehiscent; leaves linear and with spiny tips, or the plants white- 

 mealy, at least about the inflorescence. 



CHENOPODIACEAE (p. 147). 

 Flowers colored; petals present and colored, or the petals sometimes wanting 

 and the calyx colored and corolla-like. 

 Leaves deeply cordate and densely velvety-pubescent; fruit composed of 



12-15 carpels arranged in a ring. Petals yellow Abutilon (p. 203). 



Leaves not cordate, or, if so, not velvety-pubescent; fruit not of numerous 

 carpels. 

 Blades of the leaves very fleshy and succulent, obovate or terete; fruit a 

 many -seeded capsule opening by a lid. Petals present, bright- 

 colored Portulaca (p. 150). 



Blades ot the leaves thin, not fleshy; fruit not opening by a lid. 

 Flowers borne on the lower part of the stem near the ground; calyx 

 S-shaped. Petals none; leaves petioled, cordate or halberd- 

 shaped ' Aristolochia (p. 143). 



Flowers borne on the upper part of the stem; calyx never curved. 

 Calyx united with the ovary and fruit, apparently borne on top of them . 

 Petals present, yellow or purplish; fruit dehiscent, with several or 

 many seeds; plants often pubescent, never glaucous. 



ONAGBACEAE (p. 212). 



Petals none, the calyx white and corolla-like; fruit indehiscent, 



l-seeded; plants glabrous, glaucous. SANTALACEAE (p. 143). 



Calyx free from the ovary and calyx, the ovary inside the calyx. 



Petals none, the 5 sepals petal-like; fruit a juicy dark purple berry. 



Flowers in racemes PHYTOLACCACEAE (p. 150). 



Petals present; fruit dry. 

 Sepals and petals each 5; flowers corymbed or panicled; fruit 

 5-celled, as broad as long; petals yellow or blue. 



LINACEAE (p. 192). 



Sepals and petals each 4; flowers in racemes; fruit 1 or 2-celled, 



longer than broad; petals usually white, sometirpes yellow. 



BRASSICACEAE (p. 163). 

 L. 



Plants with leafy stems; leaves alternate, the blades toothed or lobed, net-veined. 



Leaves peltate (the petiole attached to the under side) . Fruit of 2 small seedlike carpels . 



Hydrocotyle (p. 219). 

 Leaves not peltate. 



Fruit and ovary covered with hooked spines. Leaves deeply lobed; corolla minute, 



greenish yellow Sanicula (p. 217). 



Fruit and ovary never with hooked spines, but rarely with straight ones. 



Leaves conspicuously lobed. 



Stems and leaves spiny. Sepals 5, united; fruit a smooth berry. 



Solanum (p. 248). 

 Stems and leaves not spiny. 



Corolla of united petals. Fruit a capsule. 



Flowers in spikes; corolla very irregular Pedicularis (p. 254). 



Flowers not in spikes; corolla regular HYDROPHYLLACEAE (p. 236). 



Corolla of distinct petals, or none. 



Calyx lobes 3; fruit sharply 3-angled, dry. Blades of the upper' leaves 



toothed, those of the lower ones deeply pinnate-lobed; plants of very 



wet situations, the sessile axillary flowers without petals. 



Proserpinaca (p. 215). 



