38 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Plants with leafy stems; leaves alternate, the blades simple, entire, net-veined. 



Stem leaves reduced to minute scales. Corolla very irregular, spurred; small slender 



plants of very wet soil PINGUICTTLACEAE (p. 255). 



Stem^loaves not reduced to scales. 

 Leaves with stipules, these sometim3s united into a sheath. 

 Stipules united and sheathing; fruit an achene. Petals none, the flowers small, 

 greenish, whitish, or pink, mostly axillary or in spikes. 



POLYGONACEAE (p. 144). 

 Stipules not sheathing; fruit a capsule or a pod, with more than one seed. 

 Petals none; plants glabrous; fruit a small 3-celled capsule. 



Phyllanthus (p. 195). 

 Petals present, yellow; plants pubescent; fruit an inflated 1-celled pod. 



Crotalaria (p. 183). 

 Leaves without stipules. 



Corolla gamopetalous, usually colored and conspicuous. 



Flowers 4-5 cm. long, white; calyx inclosed by 2 broad bracts. Leaves often 



cordate at the base; fruit a capsule Convolvulus (p. 234). 



Flowers less than 3 cm. long; calyx not inclosed by 2 broad bracts. 



Juice milky; flowers in umbels; fruit of 1 or 2 large pods, the seeds with 



tufts of hairs Acerates (p. 231). 



Juice colorless; flowers not in umbels; fruit a email capsule or berry or of 4 



nutlets, the seeds not with tufts of hairs. 



Corolla spurred, yellow. Nearly glabrous, glaucous perennial. 



Linaria (p. 250). 

 Corolla not spurred. 



Fruit of 4 nutlets; plants rough-hairy, often bristly, or glabrous and with 

 blue flowers (the flowers sometimes white, yellow, or reddish). 



BORAGINACEAE (p. 237)' 

 Fruit a capsule or a berry; plants never rough-hairy, not with blue 

 flowers. 

 Corolla white; fruit a capsule; calyx not enlarged in fruit. 



PRIMULACEAE (p. 225). 

 Corolla yellow; fruit a berry, inclosed by the enlarged bladdery calyx. 



Physalis (p. 247). 

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

 Flowers with neither calyx nor corolla, crowded in long cylindrical dense 

 spikes; leaves cordate, petioled. Plants of marshy Boil. 



SATTRTJRACEAE (p. 132). 



Flowers with a calyx and often with a corolla; leaves not cordate, or, if bo, the 



flowers not in spikes. 



Flowers green, small, the sepals never colored; petals none. Fruit dry or 



nearly so. 



Plants perennial, pubescent; fruit a capsule, with more than 1 seed. Leaves 



small and narrow -. CISTACEAE (p. 205). 



Plants annual, glabrous or pubescent; fruit an achene or a 1-seeded capsule. 

 Flowers all in loose cymose axillary clusters; style 1, not branched. 



Plants pubescent Parietaria (p. 142). 



b lowers all or most of them in spikes or terminal cymes or panicles, or 



else all in dense sessile axillary clusters; styles 2 or 3, or 1 and 



branched. 



Flowers subtended by scarious bracts, the sepals awn-pointed; fruit 



dehiscent or indehiscent; leaves never linear nor with spiny tips; 



plants never white-mealy AMARANTHACEAE (p. 148). 



