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. 
Il. MENYANTHES L. 
Perennial, scape-bearing marsh herbs. Rootstock creeping. 
Leaves of 3 leaflets. Flowers racemed. Calyx 5-parted. 
Corolla fleshy, funnel-shaped, the limb 5-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, Marsu Treroiz. Rootstocks 
stout and matted. Leaflets obtuse, entire. Flowers 2 in. in diameter, 
white or pinkish. Bogs, especially N. 
81. APOCYNACEZ. Docpane 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; 
