172 
Spring Flora of Oklahoma 
or ovoid, 4-lobed. Corolla funnel-form or salver-form, 4- 
lobed, the lobes valvate. Stamens 4, inserted on the tube 
or throat of the corolla. Ovary 2-celled. Stigmas 2, lin¬ 
ear. Capsule partly inferior, more or less distinctly 2- 
lobed. Seeds more or less concave. 
Plants l'-7' high; peduncles 1-flowered. 
Calyx-lobes narrow, about equaling the capsule. 
1. H. patens. 
Calyx-lobes broad, much exceeding the capsule. 
2. H. minima. 
Plants 4'-18' high; flowers cymose. 
3. H. angustifolia. 
1. Houstonia patens Ell. Small Bluet. Annual, glabrous or 
nearly so, branched from the base, l'-6' high. Lower and basal 
leaves oval or ovate, 5"-6" long, the upper narrower and sessile. 
Peduncles axillary and terminal, 1-flowered. Corolla violet-blue or 
purple, 3"-4" broad. Capsule compressed, didymous. 
In dry soil. March-April. 
2. Houstonia minima Beck. Least Bluets. Annual, spreading 
or diffuse, high. Lower and basal leaves oval or ovate, the 
upper oblong, sessile. Peduncles axillary and terminal, 3"-12" long. 
Flowers 4"-5" broad. Corolla violet or purple. Capsule compressed, 
didymous. 
In dry soil. March-April. Common. 
3. Houstonia angustifolia Michx. Narrow-leaved Houstonia. 
Perennial by a deep root, glabrous, usually branched, 12'-24' high. 
Leaves linear, 6"-18" long, l"-3" wide, or the lowest narrowly spat- 
ulate, usually with numerous smaller ones fasicled in the axils. Flow¬ 
ers in terminal, dense, cymose clusters. Corolla white or purplish, 
from funnel-form to salver-form, about 2" long. Capsule compressed- 
obovoid. 
In dry, open places. May-July. Common. 
IT. GALIUM L. 
Annual or perennial herbs, with 4- angled stems and 
branches. Leaves apparently verticillate. Flowers small, 
white, green, yellow or purple, in axillary or terminal cymes 
or panicles. Flowers perfect, or in some species dioecious. 
Calyx-tube ovoid or globose. Corolla rotate, 4-lobed. Sta¬ 
mens 4. Ovary 2-celled. Styles 2, short. Stigmas capitate. 
