MORNING-GLORY FAMILY 389 



than the inner ; corolla broadly funnelform, often veined with lavender externally, white vary- 

 ing to pale yellow, 2-3 cm. long. 



Dry slopes and ridges, mainly Upper Sonoran Zone; Inner Coast Ranges, San Luis Obispo County, and 

 the southern Sierra Nevada, Kern County, southward on the desert slopes of the mountains of southern Cali- 

 fornia to San Diego County, California, east through the Mojave Desert region of Mono and Inyo Counties, 

 California, to southern Nevada. Type locality: southern Nevada. May-July. 



16. Convolvulus arvensis L. Field Bindweed. Fig. 3868. 



Convolvulus arvensis L. Sp. PI. 153. 1753. 



Glabrous or pubescent, deep-rooted herb ; stems trailing, decumbent or somewhat twining, 

 3-10 dm. long. Leaves 2-3.5 cm. long, oblong-sagittate to ovate or somewhat hastate, rounded 

 or obtuse at apex, slender-petioled ; peduncles 1-4-flowered, shorter than the leaves; bracts 

 remote from the calyx, mostly subulate, sometimes wanting ; sepals oblong, obtuse, 3 mm. long ; 

 corolla white or pinkish, 1.5-2.5 cm. wide. 



Fields and waste places; Washington to southern California, and across the continent. Naturalized from 

 Europe. May-Oct. 



17. Convolvulus simulans Perry. Small-flowered Morning-glory. Fig. 3869. 



Breweria minima A. Gray, Proc. Amer. Acad. 17: 228. 1882. Not Convolvulus minimus Aubl. 1775. 

 Convolvulus pentapetaloides of authors, not L. 

 Convolvulus simulans Perry, Rhodora 33: 76. 1931. 



Low diffusely branching annual, 1-3 dm. high, stems appressed-pubescent. Leaves oblong- 

 lanceolate to linear, gradually narrowed from about the middle to a slightly winged petiole, 

 2-4 cm. long, sparsely villous on both sides ; peduncles mostly shorter than the leaves ; bracts 

 4-5 mm. below the flowers, subulate or narrowly oblanceolate, 3-8 mm. long; sepals oblong- 

 ovate, 3-4 mm. long, pubescent, with broad scarious margins ; corolla deeply 5-cleft, 6 mm. long, 

 pinkish. 



Valleys and hillsides. Upper and Lower Sonoran Zones; Lower Sacramento Valley (Antioch), South 

 Coast Ranges in San Luis Obispo County, and coastal southern California (Redondo, San Diego) to Lower 

 California. Type locality: "northern part of Lower California." March-May. 



Convolvulus althaeoides L. Sp. PI. 156. 1753. Perennial, appressed-pubescent and more or less canes- 

 cent. Lowest leaves ovate-cordate, crenately toothed, the upper 3-7-lobed with the lobes irregularly toothed 

 or divided; peduncles erect, longer than the leaves, 1-2 flowered; bracts subulate; sepals ovate-oval, 7-8 mm. 

 long; corolla purple, 2.5-3 cm. long. Native of the Mediterranean Region; locally established as a weed in 

 Ventura County, California. 



3. CRESSA L. Sp. PI. 223. 1753. 



Low much-branched perennial plants, somewhat suffrutescent at base. Leaves alter- 

 nate, small or sometimes reduced to scales, entire. Flowers solitary in the upper axils, 

 perfect, regular, 5-merous. Sepals distinct, imbricate, equal. Corolla 5-lobed, funnel- 

 form, persistent. Stamens 5, alternate with the corolla-lobes, exserted, filaments filiform 

 or subulate. Styles 2, distinct; stigma entire, capitate; ovary 2-celled, with 2 ovules in 

 each cell. Fruit a capsule, often 1-seeded by abortion. [The Greek name for a female 

 Cretan.] 



A genus of several closely related species, considered by some as a single polymorphic species, inhabiting 

 the warm temperate and tropical regions of both the Old and New World. Type species, Cressa crettca L. 



1. Cressa truxillensis H.B.K. Cressa. Fig. 3870. 



Cressa truxillensis H.B.K. Nov. Gen. & Sp. 3 : 119. 1818. 



Cressa cretica var. truxillensis Choisy in A. DC. Prod. 9: 440. 1845. 



Cressa depressa Goodding, Bot. Gaz. 37: 58. 1904. 



Cressa vallicola Heller, Muhlenbergia 8: 140. pi. 17. 1913. 



Cressa minima Heller, op. cit. 140. 



Cressa pumila Heller, op. cit. 142. fig. 28. 



Low tufted or depressed perennial, more or less densely canescent throughout, the much- 

 branched stems 1-2 dm. long. Leaves numerous, oblong-ovate to broadly lanceolate, sessile, 

 entire, 4-10 mm. long ; flowers solitary in the upper axils, short-pedicelled or subsessile ; sepals 

 oblong-ovate, 4 mm. long, silky-canescent ; corolla white, 5-6 mm. long, lobes about 2 mm. 

 long, spreading or relaxed, oblong-ovate, pubescent toward the apex on the outer surface ; ovary 

 and capsule pubescent. 



Saline soils along the coast and in the interior, Sonoran Zones; southeastern Oregon, south through 

 California to Lower California, east to Nevada, Utah, Arizona, and New Mexico; and also Mexico and South 

 America. Type locality; near Truxillo, Peru. May-Oct. 



