CUSCUTACEAE. 
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4. Cuscuta curta Engelm. ( C . Gronovii curta Engelm.) On coarse herbs 
in sandy soil in Utah and Colo.—Alt. about 7000 ft.—Dome Rock in Platte 
Canon. 
5. Cuscuta indecora Choisy. On herbs, mostly composites and leguminous 
plants, commonest on Ambrosia artemisiaefolia and Glycyrrhiza lepiota; 
from Ills, and Neb. to Fla. and Calif.—Alt. 4000-5000 ft.—Ft. Collins. 
6. Cuscuta megalocarpa Rydb. On willows; in Colo, and Wyo.—Alt. 
about 7000 ft.—Cucharas Creek near La Veta. 
7. Cuscuta cuspidata Engelm. On Ambrosia, Iva and some leguminous 
plants from Mo. and Neb. to Tex. and Colo.—Alt. 4000-5000 ft.—Ft. Collins. 
Family 112. CON VOLVULACE AE 
Styles distinct, each 2-cleft. 
Styles united up to the stigmas. 
Stigmas ovoid or subglobose. 
Stigmas filiform to oblong-cylindric. 
Vent. Morning-glory Family. 
1. Evolvulus. 
2. Ipomoea. 
3. Convolvulus. 
1. EVOLVULUS L. 
1. Evolvulus Nuttallianus R. & S. ( E . argenteus Pursh; not R. Br.; E. 
pilosus Nutt.; not Lam.) In sandy soils and on sterile plains from S. D. and 
Colo, to Tex. .and Ariz.; also Mex.—Alt. 4000-6000 ft.—Canon City; along 
Platte River, Denver; Fossil Creek, Larimer Co.; Trinidad; Ft. Collins; near 
Boulder; Ouray; Dixon Canon. 
2. IPOMOEA L. Morning-glory. 
t. Ipomoea leptophylla Torr. On plains and hillsides from S. D. and 
Wyo. to Tex. and N. M.—Alt. 4000-5000 ft.—Denver; Rocky Ford; bank of 
Arkansas River. 
3. CONVOLVULUS L. Wild Morning-glory, Bindweed. 
Bracts small, remote from the calyx. 
Plant not canescent; leaf-blades hastate, but otherwise entire. 
Whole plant glabrous or nearly so. 1. C. arvensis. 
Stem and lower surface of the leaves with scattered long hairs. 
2 . C. ambigens. 
Plant more or less canescent; leaves usually lobed or dissected. 
Main divisions of the leaf-blades ovate or oblong, obtuse, lobed. 
3 . C. hermannioides. 
Main divisions of the leaf-blades linear, entire ; the basal lobes usually cleft 
deeply. 4. C. incanus. 
Bracts large, close under the calyx and enclosing it. 
Leaf-blades hastate; the basal lobes often sinuate-dentate, acute; stem and 
leaves glabrous or slightly hairy. 5. C. americanus. 
Leaf-blades more sagittate; basal lobes rounded, entire; stem and leaves 
densely pubescent. 6. C. interior. 
1. Convolvulus arvensis L. Naturalized from Europe, growing in fields 
and waste places from N. S. and Mont, to N. J. and Colo.—Durango. 
2. Convolvulus ambigens House. In loose or sandy soil from Colo, to N. M. 
and Calif.—Alt. 5000-6000 ft.—Plains near Boulder; Ft. Collins. 
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