120 CONYOLVULACEAE. 



1. EVOLVULUS L. Erect or diffuse herbs or partially -n-oody plants. 

 Leaf-blades entire. Flowers solitary and axillary or in terminal racemes or 

 panicles. Calyx small: lobes nearly equal. Corolla white, pink, or blue, rotate 

 or rotate-f unnelf orm : limb 5-angled or 5-lobed. Capsule subglobose, 2-4- 

 valved. 



Leaf-blades broad, obtuse, abruptly pointed or acute : stem and branches pubescent. 



Perennial : peduncles very short : leaves approximate or crowded. 1. E. Wrightii. 

 Annual or biennial : peduncles mostly as long as the leaves or 

 longer : leaves distant. 



Branches villous : calyx over l^ as long as the corolla. 2. E. alsinoides. 



Branches silky : calyx less than i/^ as long as the corolla. 3. E. glaber. 



Leaf-blades narrow, acuminate : stem and branches glabrous. 4. E. Unifolius. 



4- ^^ 1. E. Wrightii House. Stem and branches tufted, mostly less than 1 dm. long, 

 villous-hirsute with silvery hairs: leaf -blades suborbicular to ovate, 3-8 mm. 

 long, acute or abruptly pointed: calyx-lobes linear-lanceolate, 4-5 mm. long, 

 acuminate: corolla blue or white, 7-9 mm. broad.— Pinelands and open sandy 

 places, L. keys. — {Cuba.) 



2. E, alsinoides L. Stem and branches diffuse or prostrate, 1-6 dm. long, 

 slender: leaf-blades oblong-oval to oblong-lanceolate, 6-2.5 mm. long, acute or 

 acutish, permanently pubescent: calyx-lobes lanceolate, 2.5-3.5 mm. long, acute: 

 corolla blue or white, 8-12 mm. broad: capsules 3-4 mm. in diameter. — Ham- 

 mocks, L. keys. — {Bah., Cvha, Ant.) 



3. B. glaber Spreng. Stem and branches diffuse, prostrate, sometimes creep- 

 ing, silky: leaf -blades oblong, oval, or obovate, mostly 1-1.5 cm. long, mucro- 

 nate, glabrous at maturity: calyx-lobes oblong, oblong-lanceolate, or oblong- 

 ovate, 3-4.5 mm. long, acute or slightly acuminate: corolla blue, pink, or white, 

 about 1 cm. broad: capsules ovoid, 2.5-3.5 mm. in diameter. — Hammocks and 

 open sandy places, L. keys. — {Bah., Cuba, Aiit.) 



- 4. E. linifolius L. Stem and branches wiry-filiform, glabrous, diffuse: leaf- 

 blades linear to linear-subulate, 0.5-2 cm. long, acuminate, glabrous: calyx- 

 lobes linear-lanceolate, 4-5 mm. long, acimiinate : corolla pale-blue or white, 

 nearly 1 em. broad: capsules subglobose, 3^ mm. in diameter. — Pinelands, Big 

 Pine Key.— {Bah., Ant.) 



2. PHARBITIS Choisy. Climbing or trailing vines. Leaf-blades entire, 

 lobed, or angled. Calyx-lobes equal or unequal, herbaceous, each with a pubes- 

 cent base and a narrow tip. Corolla white, blue, or purple, funnelform. 

 Seeds glabrous. — Morning-glory. 



//-^ " 1. P. cathartica (Poir.) Choisy. Perennial, minutely strigillose or glabrate: 

 leaf-blades broadly ovate, 5-9 cm. long, entire or 3-lobed: sepals ovate-lanceo- 

 late, 1-2 cm. long, acuminate: corolla-limb pink-purple to white, 6-8 cm, wide. 

 — Hammocks and thickets, U. S. keys, U. keys, L. keys, L. S. keys. — [E. K.] — 

 {Ber., Ball., Cuba, Ant.) 



■ ' 3. IPOMOEA L. Climbing or trailing vines or rarely upright plants. 

 Leaf-blades entire, angled, or divided. Flowers solitary on axillary peduncles, 

 or in cymes. Calyx-lobes coriaceous or membranous, or rarely fleshy. Corolla 

 funnelform, the limb usually spreading. Capsule mostly septifragally 2- or 

 4-valved. Seeds often pubescent. — Morning-glory. 



Stem and branches creeping. 



Corolla-limb white : leaf-blades several-lobed. 1. /• stolonifera. 



Corolla-limb purple : leaf-blades not lobed, notched at the apex. 2. 1. Pes-Caprae. 

 Stem and branches twining or trailing. 



Leaf-blades sagittate or hastate: Inner sepals less than 1 cm. 

 long. 



