Spring Flora of Oklahoma 
167 
1. Catalpa speciosa Warder. Western Catalpa. A large tree 
with thick, rough bark. Leaves large, heart-shaped, or broadly ovate, 
long acuminate. Corolla l'-2' long, nearly white, faintly spotted 
within. Capsule thick-walled, 8'-20' long, nearly 10" in diameter. 
Planted for shade. May-June. 
FAMILY 81. ACANTHACEiE. Acanthus Family. 
Herbs or shrubs, with opposite, simple, ex-stipulate 
leaves, and irregular or nearly regular, perfect flowers. 
Calyx inferior, persistent, 4-5-parted or 4-5-cleft. Corolla 
gamopetalous, nearly regularly 5-lobed, or conspicuously 
2-lipped. Anther-bearing stamens 4, didynamous, or 2 
only. Ovary 2-celled. Ovules 2-10 in each cavity. Style 
filiform, simple. Stigmas 1 or 2. Capsule dry, 2-celled, 
2-valved. Seeds globose or orbicular, not winged, borne on 
curved projections from the placentae. 
Corolla convolute in the bud, nearly regular; stamens 4. 
I. Ruellia. 
Corolla imbricated in the bud, strongly 2-lipped; sta¬ 
mens 2. II. Dianthera. 
I. RUELLIA (Plumier) L. 
Perennial herbs or shrubs. Leaves entire or, rarely, 
dentate. Flowers large, violet, blue, white, or yellow, sol¬ 
itary or clustered in the axils. Calyx 5-cleft, or 5-parted. 
Corolla funnel-form or salver-form, the limb spreading, 
5-lobed. Stamens 4, stigma simple or of two unequal 
lobes. Capsule oblong or club-shaped. Seeds compressed, 
ovate, or orbicular. 
Calyx-segments linear-lanceolate, scarcely exceeding the 
capsule. 1- R. strepens. 
Calyx-segments filiform-linear, exceeding the capsule. 
2. R. ciliosa. 
1 . Ruellia strepens L. Smooth Ruellia. Glabrous or sparingly 
