960 CONVOLVULACEAE 
long as the calyx ; lobes narrow, lanceolate, curling back, about as long as the tube: fila- 
ments glabrous. 
In saline soil, Texas to southern California and tropical America. Spring and summer. 
2. Cressa aphylla Heller. Foliage cinereous. Stems erect, 1-2 dm. tall, destitute 
of typical leaves, branched from near the base and throughout: leaves reduced to small 
scales: pedicels about 1 mm. long: bracts barely j as long as the calyxes, lanceolate to 
ovate-lanceolate : sepals closely pubescent, oblong-lanceolate or elliptic, 3-4 mm. long, 
acute or slightly acuminate: corolla yellowish white; tube as long as the calyx; lobes 
ovate, shorter than the tube: filaments pubescent below the middle. 
In dry or sandy soil, Texas. Spring. 
3. BVOLVULUS L. 
Annual or perennial caulescent herbs, with shaggy or appressed pubescence. Leaves 
alternate : blades entire. Flowers solitary in the axils, or in terminal racemes or panicles. 
Calyx usually pedicelled : sepals 5, nearly equal. Corolla white, pink or blue, funnel- 
form, campanulate or rotate: limb plaited, 5-angled or 5-lobed. Stamens 5: filaments 
filiform. Ovary 2-celled, globular. Styles distinct, each 2-cleft.  Stigmas slender. 
Ovules few. Capsules but little longer than broad, 2-4-valved. Seeds 1-4, glabrous. 
The plants flower from spring to fall. 
Peduncles as long as the leaves or longer. 
Leaf-blades glabrous or nearly so at maturity. 
Leaf-blades copiously pubescent. 
Peduncles wanting or very short: pedicels shorter than the leaves. 
. E. mucronatus. 
. E. alsinoides. 
om $9 Ne 
Leaf-blades glabrous above. . E. sericeus. 
Leaf-blades copiously pubescent on both sides. s 
Pubescence silky : sepals acute, erect or nearly so. . E. mollis. 
Pubescence shaggy : sepals acuminate, the tips spreading. E. pilosus. 
1. Evolvulus mucronatus Sw. Silky when young, soon glabrate. Stems branched 
at the base; branches spreading or prostrate, 1-4 dm. long, very slender : leaf-blades 
oblong to obovate, 1-1.5 cm. long, mucronate, entire, narrowed into short petioles: pedun- 
cles as long as the leaves or longer: pedicels shorter and stouter than the peduncles: 
sepals glabrate, 3-4.5 mm. long, oblong to oblong-ovate, acute : corolla rotate, about 1 cm. 
broad: capsules subglobose, 2-2.5 mm. in diameter. 
In sandy soil, Florida and the West Indies. A 
2. Evolvulus alsinoides L. Strigillose and more or less densely villous-hirsute. 
Stems branched at the base ; branches decumbent or prostrate, 1-6 dm. long, slender : 
leaf-blades oblong-oval or oblong-lanceolate, 6-25 mm. long, acute, entire, narrowed into 
short petioles : peduncles as long as the leaves or longer: pedicels recurved or refracted : 
sepals 2-4 mm. long, ovate or oblong-lanceolete, acute: corolla rotate, 8-12 mm. broad : 
capsules subglobose, 3-4 mm. in diameter. 
In sandy soil, Florida to Texas. 
3. Evolvulus sericeus Sw. Silky. Stems branched at the base ; branches ascend- 
ing or decumbent, 1-3 dm. long, slender, commonly zigzag : leaf-blades linear to oblong, 
1-2.5 cm. long, acute at the ends, glabrous above, sessile: pedicels shorter than the 
calyxes, slightly thickened upward : sepals silky, 4-6 mm. long, oblong to broadly elliptic, 
acute to acuminate : corolla white or blue, rotate, 8-10 mm. broad : capsules subglobose, 
3-4 mm. in diameter. : 
In low grounds, Georgia and Florida to Texas and Arizona. Throughout tropical America. 
4. Evolvulus móllis Small. Silky. Stems branched at the base; branches ascend- 
ing or decumbent, 5-20 cm. long, slender: leaf-blades linear to linear-oblong or linear- 
lanceolate, 1-2.5 cm. long, acute, sometimes scythe-shaped, entire, sessile or nearly so: 
pedicels shorter than the calyxes: sepals more or less densely lanuginose, 4-6 mm. ut. 
oblong or lanceolate, 4-5 mm. long, narrowly acute, erect or nearly so: corolla bluish, 10- 
14 mm. broad : capsules globose-ovoid, 4-5 mm. in diameter. 
In dry soil, Texas. 
5. Evolvulus pildsus Nutt. Densely silky-hirsute, silvery, becoming tawny 95 ues 
ruginous. Stems much branched at the base ; branches ascending or spreading, Des cm. 
long, stout: leaf-blades oblong or broadest above the middle or below it, 1-1.5 Ferd md 
acute, densely pubescent on both sides, sessile or short-petioled : pedicels curved, T "s 
than the calyxes, densely pubescent : sepals silky, 6-8 mm. long, linear-lanceolate, 5- a 
long, long-acuminate, the tips widely spreading: corolla about 1 cm. broad : capsules a 
3 mm. long. [E. argenteus Pursh.] 
In dry soil, Kansas to Colorado, south to Texas, Arizona and Mexico. Also on Key West, Florida. 
