924 GENTIANACEAE 



not prominently nerved : calvx narrowly campanulate, 2.5-3 mm. long"; lobes ovate-lanceo- 

 late, obtuse, denticulate : corolla at lengtb much longer than the calyx, whitish, 3-5 mm. 

 long, marked with dark stripes ; tube somewhat constricted at the throat, about as long as 

 the linear-lanceolate erect or converging, rather obtuse lobes : capsule sessile or nearly so, 

 4 mm. long, its two horns slightly longer than the body, converging. 

 In wet places, southern Georgia and Florida. Summer and fall. 



4. POLYPREMUM L. 



Annual glabrous herbs. Stem difilisely branched at the base : branches dichotomous, 

 four-angled. Leaves basal and clustered, cauline and opposite : blades narrow, the bases 

 dilated and somewhat connate. Flowers solitary and sessile in the forks of branchlets and 

 axils of the leaves. Calyx longer than the corolla : lobes 4 or 5, somewhat foliaceous, rigid. 

 Corolla campanulate : tube slightly constricted near the top : lobes 4 or 5, shorter than the 

 tube, imbricated, bearing a ring of villous hairs at their junction with the tube. Stamens 4 

 or rarely 5, adnata to about the middle of the corolla-tube. Ovary 2-celled : style very short, 

 tipped with a capitate or somewhat 2-lobed stigma. Ovules numerous in each cavity, at- 

 tached to placentae which are fixed by their bases to the septum. Capsule slightly 2-lobed, 

 somewhat flattened contrary to the septum, loculicidal. Seeds numerous, smooth. 



1. Polypremum procumbens L. Stems diflusely branched, often tufted, the branches 

 erect or spreading, 1-3 dm. long : leaf-blades acute, obscurely scabrous in the margins with 

 spine-like hairs, dilated at the base and somewhat connate by their narrow stipules : flow- 

 ers axillary or in small terminal cymose clusters : calyx about 3 ram. high ; lobes lanceo- 

 late, with a strong midrib, scarious margins and spine-like hairs : corolla white : capsules 

 obovoid or subglobose, about 2 mm. long, flattened contrary to the septum, each tipped with 

 the short style : seeds numerous, subglobose or obscurely angled, 0.4 mm. in diameter. 



In dry sandy soil, Pennsylvania to Florida and Texas. Also in the West Indies and Mexico. 



6. BUDDLEIA L. 



Shrubs or trees, or shrubby herbs, usually with pubescent, scurfy or granular foliage. 



Leaves opposite : stipules evident, but sometimes a mere line. Flowers in dense heads or 



more rarely in open panicles. Calyx campanulate, 4-lobed or rarely 5-lobed. Corolla 



rotate-campanulate, or sometimes salverform : tube straight or curved : lobes broad. 



Stamens 4 or rarely 5 : filaments adnate to the corolla-tube, sometimes up to the throat. 



Ovary 2-celled : styles united. Capsule globular or oblong, septicidally 2-valved, the valves 



mostly 2-cleft at the apex and separating from the united placentae. 



Flowers in panicles : corolla 12-15 mm. long ; tube curved : leaf-blades entire. 1. B. Lindleyana. 



Flowers in racemed heads : corolla 2-2.5 mm. long; tubestraight: leaf-blades toothed. 2. B. racemosa. 



1. Buddleia Lindleyana Fort. A difliisely branching shrub 1-2 m. tall, the 

 branches angled. Leaf-blades ovate to lanceolate, 3-9 cm. long, acuminate, entire, 

 glabrous and paler beneath than above : panicles raceme-like, loosely spreading or some- 

 what drooping: calyx 2-2.5 mm. long, puberulent: corolla purplish violet or reddish, 

 12-15 mm. long, granular-puberulent : tube curved. 



In waste places and about gardens, throughout the Gulf States and in some of the contiguous 

 states. Introduced from China. Summer and fall. 



2. Buddleia racemosa Torr. A branching shrub, 4-11 dm. tall, the branches 

 nearly terete. Leaf-blades ovate-oblong to oblong-lanceolate or lanceolate, 2.5-11 cm. 

 long, acute or obtusish, coarsely toothed, broadly cuneate or truncate and often somewhat 

 hastate at the base, puberulent beneath : branches of the panicle terminating in globular 

 heads 5-8 mm. in diameter : calyx tomentulose : corolla 2-2.5 mm. long ; tube straight, the 

 upper part tomentulose. 



In rocky soil or on banks, southern and western Texas. Spring and summer. 



Family 2. GENTIANACEAE Dumort. Gentian Family. 



Annual or perennial caulescent herbs, or rarely shrubs, with a watery sap, 

 and pervaded with a bitter tonic principle. Leaves typically opposite : blades 

 simple, sometimes connate at the base and sheathing. Inflorescence cymose, 

 often congested. Flowers perfect, regular, often showy. Calyx of 2, 4 or 5 

 more or less united sepals, persistent. Corolla of 4 or 5, or more, mostly convo- 

 lute, sometimes imbricated petals : limb often spreading, commonly showy : lobes 



