MONOPETALOUS EXOGENOUS PLANTS. 433 



EVOLVULUS, L. 



Sepals 5 ; corolla bell-shaped or somewhat wheel-shaped, 

 mostly hairy ; sta?ne?is included ; styles 2, distinct, 2-cleft 

 or 2-parted; stigma obtuse; capsule 2-celled, 4-seeded. — 

 Small perennial herhs, with chiefly silky or hairy prostrate 

 stems, entire leaves, and small flowers on axillary pedun- 

 cles; capsules nodding. 



* Common peduncles very short or none; the pedicels shorter than the leaves. 



E. SERiCEUS, Swartz. Silky with appressed hairs 

 throughout, except the upper surface of the leaves ; stem 

 dividing at the base into numerous prostrate or ascending 

 simple filiform branches ; leaves sessile, linear, or linear-lan- 

 ceolate, acute at each end, erect ; peduncle almost wanting, 

 1-flowered, rarely 2"-3" long and 2-3-flowered ; sepals ovate- 

 lanceolate, acuminate, J as long as the white wheel-shaped 

 corolla. — Varies with shorter (4'-6' long) and more rigid 

 stems, and oblong or elliptical and obtuse leaves. Damp 

 soil. June-October. Stems 6-12' long; leaves 6' -9" 

 long ; corolla 4' -5" in diameter. 



** Peduncles longer than the leaves. 



E. GLABRiuscuLus, Chois. Stem creeping, simple, 

 sprinkled with appressed hairs ; leaves rigid, elliptical-obo- 

 vate, mucronate, nearly sessile, smooth above, pubescent 

 on the veins beneath ; peduncles bristle-like, rather longer 

 than the leaves, 1-3-flowered ; sepals ovate-lanceolate, 

 acute, hairy, as long as the pedicel ; corolla very small. 

 Stem 1° long; leaves 4"-6" long; corolla 2" wide. 



STYLISMA, Raf. 



Sepals 6 ; corolla bell-shaped, hairy; stamens included; 

 styles 2, distinct or united below, entire ; stigmas peltate ; 

 ovary 2-celled, 4-ovuled; capsule 1-4-seeded. — Perennial 



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