34 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves not 2-ranked; fruit a capsule or a berry. 



Flowers blue or purple. Leaves linear; fruit a capsule.. Tradescantia (p. 116). 

 Flowers not blue or purple. 

 Fruit a berry; plants never with bulbs; leaves sometimes a single whorl at 



the top of the stem CONVALLARIACEAE (p. 123). 



Fruit a capsule; plants often with bulbs; leaves never a single whorl. 

 Style 1 and cleft to below the middle, or styles 3; stems sometimes 

 branched; flowers mostly small and greenish. 



MELANTHIACEAE (p. 119). 



Style 1, cleft only at the summit; stems simple up to the inflorescence; 



flowers mostly large and brightly colored LILIACEAE (p . 120) . 



H. 



Plants with leafy stems; leaves all or part of them opposite, the blades simple, 

 entire, net- veined. 



Flowers sessile in dense heads on a common receptacle surrounded by an involucre 

 of bracts. Fruit an achene Group J (p. 37) . 



Flowers not sessile in dense heads on a common receptacle surrounded by an involucre 

 of bracts a, aa. 



A. COROLLA OAMOPETALOU9 (OF UNITED PETALS), ALWAYS PRESENT, CONSPICUOUS, 



COLORED. 



Corolla conspicuously irregular. 

 Fruit of 4 small nut lei s in the bottom of the calyx; stems usually conspicuously 



4-angled; leaves usually gland-dotted MENTHACEAE (p. 239). 



Fruit a dehiscent capsule; stems usually not 4-angled; leaves not gland-dotted. 

 Capsules abruptly contracted at the base into a short sialk; flowers purplish, in 

 axillary clusters or spikes; seeds few, borne on hooks in the capsule. 



ACANTHACEAE (p. 255). 



Capsules not contracted at the base; flowers blue, white, pink, or purplish, 



racemose or axillary and then usually solitary; Beeds often numerous, not 



borne on hooks SCROPHULARIACEAE (p. 248). 



Corolla regular or nearly so. 

 Leaves in whorls. 

 Leaves ghind-dotted; corolla bright yellow; fruit a glabrous capsule with more 



than 2 seeds Lysimachia (p. 225). 



Leaves not gland-dotted; corolla white or greenish, never bright yellow; fruit of 



2 1 -seeded indehiecent united nutlets, often hairy Galium (p. 257). 



Leaves not in whorls. 

 Leaves with stipules, or the petioles connected by a stipular membrane. 

 Calyx united with the ovary and capsule; flowers never red. 



RUBIACEAE (p. 257). 

 Calyx free from the capsule; flowers red or white.... LOGANIACEAE (p. 228). 

 Leaves without stipules. 

 Ovaries 2, each or only one developing into a large pod, this usually 5 cm. long 

 or more. Seeds usually with a tuft of down; juice usually milky. 

 Flowers solitary or in cymes; corolla bell-shaped and shallowly lobed or 

 funnelform, white, pink, or blue; pods slender, rarely over 6 mm. in 

 in diameter, glabrous, smooth. Leaves sometimes evergreen. 



APOCYNACEAE (p. 229). 



Flowers in umbels; corolla neilher bell-shaped and shallowly lobed nor 



funnelform, never blue; pods stout, usually more than 6 mm. in diameter, 



often pubescent or tuberculate ASCLEPIADACEAE (p. 231). 



