KEY TO THE SPECIES 63 



2. CONVOLVULUS (Bindweed) 



Trailing, twining, or erect herbs with funnel-form to bell-shaped corolla, and a 

 Bingle style with 2 slender or oval stigmas. 



1. Convolvulus sepium (Hedge Bindweed). Smooth or somewhat hairy ; 

 stem twining or extensively trailing ; leaves triangular-halberd-shaped or arrow- 

 shaped, acute or pointed, the basal lobes obliquely truncate and often toothed or 

 lobed ; calyy: inclosed in two broad leafy bracts ; corolla white or tinged with 

 rose ; stigmas oval. Along streams. (See Plant Structures, p. 273, Fig. 258.) 



2. Convolvulus arvensis (Bindweed). Stems low, prostrate, or twining ; 

 leaves ovate-oblong, arrow-shaped, with acute basal lobes ; cal3''x without inclosing 

 bracts ; corolla white or tinged with red ; stigmas very slender. Fields ; from 

 Europe. 



3. EVOLVULUS (Evolvulus) 



Mostly silky-pilose perennial herbs, with small leaves and small axillary 

 flowers, filiform filaments and a 2-celled ovary. 



1. Evolvulus pilosus Nutt. Branched from a woody- base, 6-15 cm. high, the 

 branches slender and leafy ; flowers solitary in the axils ; the corollas blue or 

 purplish, short-funnel-form or nearly rotate. 



LV. POLEMONIACEiE (Polemonium Family) 



Herbs with alternate or opposite leaves, reg-ular 5-parted 

 sympetalous flowers, 5 stamens on the corolla-tube, a 3-lobed 

 style, and a superior 3-celled ovary becoming a pod. 



1. Phlox. Corolla salver-form ; leaves opposite, entire. 



2. Gilia. Corolla funnel-form or tubular ; leaves opposite or alternate. 



3. Collomia. Corolla tubular ; leaves alternate, entire. 



4. Polemonium. Corolla funnel-form ; leaves alternate, pinnately com- 

 pound. 



1. PHLOX (Phlox) 



Perenn^l' herbs, ours mostly low, with somewhat woody caudex, opposite 

 sessile entire leaves, terminal clusters of flowers, narrow tubular calyx, corolla 

 with long tube and 5 flaring lobes and stamens very unequally inserted and 

 included in the tube. (See Plant Relations, p. 80, Fig. 74b ; also Plant Structures^ 

 p. 228, Fig. 210b.) 



* Cespitose, the mats low and broad. 



1. Phlox bryoides Nutt. (Moss Phlox). Mats depressed, very dense ; leaves 

 imbricated, 4-ranbed, , minute, from ovate to lanceolate, copiously ciliate with 

 woolly hairs ; tube of the white corolla longer than the calyx. Denuded stony 

 sloi)es and hilltops. 



2. Phlox Hoodii glabrata Elias Nelson (Laramib: Phlox). Mats closely 

 appressed to the ground, profusely slender branched, glabrous except for a few 

 woolly hairs on the calyx and at the base of the subulate, 4-10 mm. long leaves ; 

 corolla white, rarely pink. 7-10 mm. broad, its tube longer than the calyx. One 

 of the earliest flowers on the plains and in the foothills. So closely appressed to 



