192 KEY AND FLORA 



4-8-lobed. Stamens 4-8, inserted on the corolla tube ; fila- 

 ments thread-shaped; anthers facing inwards. Ovary 1-2- 

 celled ; ovules many, on 2 opposite placentas. Capsule 1-celled 

 or partially 2-celled, 2-valved, many-seeded. [The best known 

 genus, Gentiana, consists mainly of autumn-flowering species.] 



I. OBOLARIA L. 



A low, smooth, purplish-green perennial. Flowers axillary 

 and terminal. Calyx of 2 distinct, spatulate, bract-like sepals. 

 Corolla tubular-bell-shaped, 4-lobed. Stamens' short, inserted 

 at the notches of the corolla. Style short; stigma 2-lipped. 

 Capsule ovoid, more or less 2-4-celled; seeds very minute 

 and numerous. 



1. 0. virginica L. PENNYWORT. Stem 3-8 in. high, often several 

 from the same root. Leaves somewhat fleshy, wedge-obovate or 

 somewhat diamond-shaped, often truncate, sessile. Flowers opposite 

 or terminal in threes, nearly sessile. Corolla pale purple or nearly 

 white. Rich woodlands, among dead leaves. 



H. MENYANTHES L. 



Perennial, scape-bearing marsh herbs. Kootstock creeping. 

 Leaves of 3 leaflets. Flowers racemed. Calyx 5-parted. 

 Corolla fleshy, funnel-shaped, the limb o-parted. Stamens 5, 

 inserted on the corolla tube. Disk of 5 hypogynous glands. 

 Ovary 1-celled ; style thread-shaped ; stigma 2-lobed. Capsule 

 globose, many-seeded. 



1. M. trifoliata L. BUCK BEAN, MARSH TREFOIL. Rootstocks 

 stout and matted. Leaflets obtuse, entire. Flowers f in. in diameter, 

 white or pinkish. Bogs, especially N. 



81. APOCYNACEJE. DOGBANE FAMILY 



Trees, shrubs, or herbs, with milky juice, often climbing. 

 Leaves usually opposite, rarely whorled, entire, nearly or 

 quite without stipules. Flowers actinomorphic, solitary or in 

 cymes. Calyx 4-5-cleft. Corolla hypogynous, funnel-, salver-, 

 or bell-shaped, sometimes with scales in the throat. Stamens 

 4-5, borne on the corolla tube or throat ; filaments very short ; 



