384 CONVOLVULACEAE 



6. Convolvulus aridus Greene. Southern California Morning-glory. Fig. 3858. 



Convolvulus aridus Greene, Pittonia 3: 330. 1898. 



Stems usually several from the crown of a stout woody root, at first erect, later elongated 

 and trailing or more often strongly twining, herbage somewhat cinereous with a fine rather 

 dense tomentulose puberulence. Leaves usually with short petioles, the central lobe triangular- 

 lanceolate, acute or obtusish, the basal lobes short acute or rounded at apex; peduncles 1 -flowered, 

 about twice as long as the leaves ; bracts closely enveloping the calyx, ovate-lanceolate, acute, 

 thin and greenish; sepals lanceolate, acute; corolla cream-white, 3-3.5 cm. long and as broad. 



Mesas and foothills, Upper Sonoran Zone; interior valleys and hills of cismontane southern California from 

 the southern slopes of the San Gabriel and San Bernardino Mountains to Riverside County and eastern Orange 

 County, California. Type locality: "foothills in the interior southern California" (near San Bernardino). April- 

 July. 



Convolvulus aridus subsp. intermedius Abrams, Contr. Dudley Herb. 3: 357. 1946. Plants trailing 

 or climbing over bushes, often for several meters, glabrous or very sparsely pilose-tomentulose; leaves variable, 

 the central lobe triangular-lanceolate, basal lobes usually not over one-third as long as the central, entire or ob- 

 scurely and broadly 2-toothed, sinus broad or rarely narrow; bracts ovate-lanceolate, acutish, 12-16 mm. long, 

 greenish; sepals similar to the bracts, acute or short-cuspidate; corolla 3-3.5 cm. long, white or sometimes 

 striped with purple on the folds exposed in bud. Coastal hills and valleys from the Santa Monica and Santa 

 Susana Mountains. Los Angeles County to western Orange County, California. Type locality: near Inglewood, 

 Los Angeles County. 



Convolvulus aridus subsp. longilobus Abrams, Contr. Dudley Herb. 3:358. 1946. Plants trailing 

 or twining, sparsely and minutely tomentulose; leaves strongly hastate, the central lobe triangular-lanceolate to 

 narrowly lanceolate, mostly 3-4 cm. long, basal lobes at least half as long as the central one, often sharply and 

 deeply 2-toothed or bifid; peduncles 1-flowered, slender, 8-10 cm. long, those on the small-leaved branchlets only 

 3-4 cm. long; bracts broadly ovate to broadly oblong, thin and often reddish purple, obtuse to rounded or even 

 truncate at ape.x, obtuse at base, equaling or slightly exceeding the ovate acute sepals and closely investing them; 

 corolla white or cream-white, 3-3.5 cm. long. The typical form of the subspecies is found on low hills and in 

 valleys in the vicinity of San Diego; northward in western Orange County it intergrades with the subspecies 

 intermedius, and east of the Santa Ana Mountains in northern San Diego County and adjacent Riverside, it 

 intergrades with the typical species and with subspecies tenuif alius. Type locality: San Diego. 



Convolvulus aridus subsp. tenuifoHus Abrams, Contr. Dudley Herb. 3: 359. 1946. (Convolvulus 

 occidcntalis var. angustissimus of authors, and C. occidentalis var. tenuissimus of authors, not A. Gray.) Plants 

 smaller, glaucous-green, glabrous or thinly tomentulose. the stems very slender, mostly 1 mm. or less in di- 

 ameter, at first erect, later rather closely twining over low shrubs; leaves very narrow, those in the lower parts of 

 the stem 2-i cm. long with the middle lobe narrowly linear-lanceolate and 2-3 mm. wide, the upper gradually 

 smaller until the uppermost, especially those near the tips of the branchlets, almost filiform and only 5-15 mm. 

 long, the basal lobes widely divergent, usually at right angles to central lobe and about half as wide and a 

 third as long, entire or in the lower on the most vigorous plants sometimes 2-toothed; peduncles 1-2-flowered; 

 bracts lanceolate to narrowly ovate-lanceolate, sharply acuminate at apex, 7-10 mm. long, membranous and rose- 

 purple, strigose-tomentose; sepals similar to the bracts but glabrate and pale with broad scarious margins; co- 

 rolla 2-3 cm. mostly 2.5 cm. long, cream-white sometimes fading purplish. Dry mesas and hillsides, mainly 

 associated with open chaparral, Sonoran Zones; back of the immediate coast, San Diego County, California, 

 south to northwestern Lower California. Type locality: hills near Bernardo (San Dieguito), San Diego County. 



7. Convolvulus nyctagineus Greene. Oregon Morning-glory. Fig. 3859. 



Calystegia atriplicifolia Hallier f. Bull. Herb. Boiss. 5: 385. pi. 13. 1897. 

 Convolvulus nyctagineus Greene, Pittonia 3: 327. 1898. 

 Convolvulus atriplicifolius House, Muhlenbergia 4: 54. 1908. Not Poir. 1813. 

 Volvulus atriplicifolius Farwell, Amer. Midi. Nat. 12: 130. 1930. 



Plants with a slender slightly fleshy branching rootstock, glabrous throughout, subacaules- 

 cent or stems trailing or somewhat twining and 3-6 dm. long. Leaves ovate-cordate to broadly 

 hastate, the basal lobes short or sometimes horizontally spreading and nearly as large as the 

 median one ; petioles, at least of the lower leaves, as long or longer than the blades ; peduncles 

 as long or lon.ger than the leaves: bracts oval or ovate, obtuse, slightlv cordate at base, 12-20 

 mm. long, concealing the calyx and well-exceeding it ; corolla cream-white or tinged with pink, 

 4-5 cm. long. 



Open woods and grassy slopes, mainly Transition Zones; Klickitat County, Washington, south through 

 the Cascade Mountains and western Oregon to Del Norte, Lake, and Butte Counties, California. Type locality: 

 Oregon. May-July. 



8. Convolvulus subacaiilis (Hook. & Arn.) Greene. Hill Morning-glory. 



Fig. 3860. 



Calystegia subacaulis Hook. & Arn. Bot. Beechey 363. 1838. 

 Convolvulus californicus Choisy in A. DC. Prod. 9: 405. 1845. 

 Convolvulus subacaulis Greene, Man. Bay Reg. 265. 1894. 

 Convolvulus subacaulis var. dolosus Jepson, Man. Fl. PI. Calif. 777. 1925. 



Plants with very slender branching rootstocks, stemless or the stems very short, more or 

 less pilose-pubescent throughout. Leaves long-petioled, the blades ovate-deltoid, rounded to 

 acute at apex, cuneate to truncate at base, sometimes hastate with short lobes ; pedicels much 

 shorter than the petioles ; bracts oblong to oblong-lanceolate, 12-16 mm. long, pilose or some- 

 times glabrous, equaling but not concealing the calyx; corolla 4.5-5 cm. long, cream-white 

 within, tinged with purple on the folds without. 



Open hillsides, Transition and Upper Sonoran Zones; central California Coast Ranges, from Tuolumne 

 and Solano counties to San Luis Obispo County, California. Type locality: California. April-June. 



