WOOTON AND STANDLEY FLORA OF NEW MEXICO. 515 



1. Cuscuta squamata Engelm. Trans. Acad. St. Louis. 1: 510. 1859. 

 Type locality: "El Paso." 



Range: Western Texas and southern New Mexico and southward. 

 New Mexico: Mesilla Valley; south of Roswell. Lower Sonoran Zone. 

 Common on Helianthus ciliaris and other plants of the valleys. 



2. Cuscuta umbellata H. B. K. Nov. Gen. & Sp. 3: 121. 1818. 



Type locality: "Crescit in Nova Hispania, inter QuereHaro et Salmanca, alt. 

 900 hex." 



Range: Colorado and Texas to Arizona and Mexico. 



New Mexico: Santa Fe; Pajarito Park; Clayton; Torrevios; Hillsboro; Tortugas 

 Mountain; Chavez; Duck Creek Flats. Lower and Upper Sonoran zones. 



On many small herbs, such as Trianthema portulacastrum, Kallstroemia brachystylis, 

 Cladothrix lanuginosa, Chamaesyce spp., Eriogonum rotundifolium, Bahia dealbata, 

 Wedeliella glabra, Boerhaavia torreyana, Cassia bauhinioides, Chamaesaracha conioides, 

 and many others; also on cultivated beets. 



3. Cuscuta curta Engelm.; Rydb. Colo. Agr. Exp. Sta. Bull. 100: 273. 1906. 

 Cuscuta gronovii curta Engelm. Trans. Acad. St. Louis 1: 508. 1859. 



Type locality: "Northwest America." 



Range: Utah and Colorado to Arizona and New Mexico. 



New Mexico: Shiprock; P'armington ; Albuquerque; Santa Fe; Sandia Moun- 

 tains; Nara Visa; Ojo Caliente; Chiz; Mogollon Mountains; Kingston; Mesilla Valley; 

 La Luz; White Mountains. Chiefly in the Upper Sonoran and Transition zones. 



On various plants, such as Gaertneria acanthicarpa, Peritoma serrulatum, Salix, 

 Salsola pestifer, Xanthium commune, Helianthus annuus, Rumex mexicanus, and 

 Aster hesperius, and on cultivated plants such as beets and chile. 



4. Cuscuta epithymum L. Sp. PI. 124. 1753. Clover doddee. 

 Type locality: "Habitat in Plantis Europae parasitica." 



New Mexico: Cedar Hill (Standley 8058). 

 On alfalfa; introduced from Europe. 



118. C0NV0LVULACEAE. Morning-glory Family. 



Annual or perennial herbs, often twining; leaves alternate, exstipulate; flowers 

 perfect and regular, axillary, solitary or cymose; calyx of 5 more or less united 

 imbricated sepals, persistent; corolla hypogynous, convolute in bud, the limb often 

 entire; stamens 5, alternate with the divisions of the corolla, often epipetalous; 

 pistil of 2 more or less united carpels, the ovary 2 to 5-celled, on a fleshy disk; styles 

 often united; fruit a capsule, 1 to 5-celled, the seeds large; endosperm mucilaginous. 



KEY TO THE GENERA. 



Styles distinct or at least partly so; decumbent or as- 

 cending herbs, not twining or trailing. 

 Styles partially united, entire; limb of corolla 



deeply 5-lobed, the lobes ovate-lanceolate. . . 1 . Cbessa (p. 516). 

 Styles distinct, each 2-cleft; corolla limb not lobed . 2. Kvolvulus (p. 516). 

 Styles united up to the stigma; climbing or trailing 

 vines (except Ipomoea leptophylhi). 

 Corolla narrowly funnelform, nearly salverform, 



bright scarlet; stamens and style exserted 3. Qtamoclit ip. 517). 



Corolla broadly funnelform, never scarlet; stamens 

 and style included. 



Stigmas] to 3, ovoid or eubglobose ■>. [pomoea. (p. 617). 



Stigmas usually 2, filiform t<> oblong-cylindric. 5. Colvulvli.i s (p, 519). 



