MORNING-GLORY FAMILY 675 



rarely 4-lobed. Stamens 5, alternate with the corolla-lobes, partially adnate 

 to the corolla-tube; anthers 2-celled, erect or incumbent. Gynoecium of 

 2 or 3 united carpels; ovary 2- or 3-celled, or by false partitions 4- or 6-celled; 

 styles usually united; ovules 1 or 2 in each cavity. Fruit a capsule, 2-6- 

 celled, or by breaking down of the septum 1 -celled. Seeds large; endosperm 

 mucilaginous; embryo curved with large plaited or crumpled cotyledons. 



Styles distinct or partly so. 



Corolla not plaited; styles simple. 1. CRESSA. 



Corolla plaited ; styles 2-cleft. 2. E VOLVULUS. 

 Styles united up to the stigmas. 



Stigmas subglobose. 3. IPOMOEA. 



Stigmas linear to oblong-cylindric. 4. CONVOLVULUS. 



1. CRESSA L. 



Perennial plants, branched, and somewhat suffrutescent at the base. Leaves 

 small or reduced to scales, alternate. Flowers perfect, regular, solitary in the 

 upper axils. Sepals 5, equal, distinct, imbricate. Corolla funnelform, per- 

 sistent, 5-lobed. Stamens 5, exserted. Ovary more or less perfectly 2-celled; 

 styles distinct; ovules 2 in each cavity. 



Stem erect; pedicels longer than the leaves. 1. C. erecta. 



Stem decumbent; pedicels shorter than the leaves. 2. C. depressa. 



1. C. erecta Rydb. Stem 2-3 dm. high, with erect branches, silvery-canes- 

 cent; leaves elliptic, 5-7 mm. long, acute at both ends, sessile, silvery-canescent ; 

 bracts elliptic, 3 mm. long; sepals 4-5 mm. long, oval, equalling the corolla-tube; 

 corolla white; lobes elliptic, acutish, rarely spreading; filaments filiform, slightly 

 pubescent; ovary densely pubescent. Saline places near hot springs: Utah. 

 Son. Jl. 



2. C. depressa Goodding. Stem many-branched, depressed, spreading, 1-2 

 dm. long, loosely canescent; leaves loosely canescent, oblong to oval, subacute, 

 5-10 mm. long, 3-4 mm. wide; sepals 4 or 5, elliptic or oval, 5 mm. long, sub- 

 tended by two bracts; corolla campanulate; lobes oval, subacute, reflexed, silky 

 pubescent; filaments broadly subulate; ovary silky-lanate at the summit. Saline 

 ground: Utah Nev. s Calif. Son. My-O. 



2. EVOLVULUS L. 



Annual or perennial pubescent herbs. Leaves alternate, entire. Flowers 

 perfect, regular, solitary in the axils, or in terminal racemes or panicles. Sepals 

 5, nearly equal. Corolla funnelform, campanulate or rotate, white, pink, or 

 blue, with 5-angled or 5-lobed limb. Stamens 5, with filiform filaments. Styles 

 2, distinct, each 2-cleft; stigmas slender. Capsule short, 2-4-valved; seeds 1-4, 

 glabrous. 



1. E. Nuttallianus R. & S. Perennial, with a more or less woody base; 

 stems branched below, ascending or spreading, 1.5-2.5 dm. high, silky-hirsute; 

 leaves subsessile, silky-hirsute on both sides, oblong or oblanceolate, 1-1.5 cm. 

 long, acute; sepals silky, linear-lanceolate, acuminate; corolla about 1 cm. broad. 

 E. argenteus Pursh., not R. Br. E. pilosus Nutt., not Lam. Sandy soil: S.D. 

 Mo. Tex. Ariz. Colo. Plain Submont. My-Jl. 



3. IPOMOEA L. MORNING-GLORY. 



Annual or perennial, usually climbing or trailing vines, or rarely erect. Leaves 

 alternate, entire or lobed. Flowers perfect, regular, solitary and axillary, or 

 cymose. Sepals 5, closely imbricate. Corolla funnelform, of various colors, with 

 a spreading limb. Stamens 5, included. Ovary 2- or 4-celled; styles united. 

 Capsule septicidal, 2- or 4-valved. Seeds often pubescent. 



Plant bushy, not climbing; leaves linear. 1. I. leptophylla. 



Plant climbing; leaf-blades cordate. 2. I. purpurea. 



1. I. leptophylla Torr. Perennial, with a deep-seated enormous fleshy 

 root; stems several, erect or ascending, 3-12 dm. high, glabrous; leaves linear, 





