CONVOLVULUS 



CONVOLVULUS 



839 



A. Calyx with 2 menibranaceous brads at the base: 



peduncles usually 1-fld. (Calystegia.) 



B. St. prostrate, 8 in. to 2 ft. high: peduncle usually 



shorter than the Ivs. 



1. calif ornicus, Choisy (C. villdsus, Gray. Caly- 

 stegia villdsa, Kellogg). Plant densely white-villose 

 throughout: st. prostrate, scarcely twining: Ivs. slender- 



1047. 



Convolvulus 

 japonicus. 



CXH) 



petioled, reniform- hast ate to 

 sagittate, the upper acuminate, 

 1 in. or less long, the basal lobes 

 often coarsely toothed: bracts oval or ovate, com- 

 pletely inclosing the calyx: fls. cream-yellow, 1 in. long. 

 C alif . Perennial . 



2. malacophyllus, Greene. Similar to the preceding 

 but foliage velvety ( or plushy pubescent. Calif. Peren- 

 nial. Other closely related Californian species are 

 C. saxicola, Eastw., C. deltmdeus, Greene, C. Berryi, 

 Eastw. and C. atriplicifdlius, House. 



BB. St. tunning or trailing, 8-10 ft. high: peduncle 

 exceeding the Ivs. 



3. japonicus, Thunb. (Calystegia pubescens, Lindl.). 

 CALIFORNIA ROSE. Fig. 1047. Hardy perennial herba- 

 ceous twiner: growth very vigorous, often 20 ft.: whole 

 plant more or less densely and minutely pubescent: 

 Ivs. hastate, lanceolate, obtuse or broadly acute, with 

 angular or rounded lobes at the base, variable, 

 occasionally without lobes, rarely sharp lanceolate: fls. 

 bright pink, 1-2 in. broad, produced freely during the 

 summer months and remaining expanded for several 

 days. Japan and E. Asia. The double form is now 

 naturalized from S. E. N. Y. to D. C. and Mo. P.M. 

 13:243. F.S. 2:172. B.R. 32:42. The double form 

 is completely sterile, with narrow wavy petals, irregu- 

 larly arranged, the outer somewhat lacerate. A valuable 

 decorative plant for covering stumps and walls. In 

 rich soil the roots spread rapidly, and will smother out 

 all other plants unless confined in tubs. The Calystegia 

 pubescens of Lindley has been wrongly referred to 

 Ipomcea hederacea, but the two plants are very different, 

 the former being perennial and the latter annual. See 

 Journ. Hort. Soc. 1:70 (1846). The plant is commonly 

 confounded with C. Sepium. 



4. occidentals, Gray. Hardy perennial, herbaceous 

 or with suffrutescent base: st. twining, several feet 

 high, glabrous or minutely pubescent: Ivs. from angu- 

 late-cordate, with a deep and narrow sinus, to lanceo- 

 late-hastate, the posterior lobes often 1-2-toothed: 

 peduncle 1-fld. or proliferously 2-3-fld., bracts ovate or 

 lanceolate, usually completely inclosing the calyx, 

 variable; corolla white or pinkish, 1-2 in. long; stig- 

 mas linear. Dry hills, Calif. Listed as early as 1881. 



An admirable plant for rockeries. Several related species 

 are native also to Calif.: C. cyclostegius, House, C. Bing- 

 hamise, Greene, C. polymorphus, Greene, C. Greenei, 

 House, C. dridus, Greene, C. purpurdtus, Greene, C. 

 illecebrdsus, House, C. gracilcntus, Greene, and C. Idngi- 

 pes, Wats. 



5. Sepium, Linn. (Calystegia Sepium, R. Br.). RUT- 

 LAND BEAUTY. Fig. 1048. Perennial trailer, 3-10 ft. long, 

 glabrous or minutely pubescent: Ivs. round-cordate 

 to deltoid-hastate, the basal lobes divaricate, entire or 

 angulate: fls. white, rose or pink, with white stripes. 

 F.S. 8:826. B.M. 732. A.G. 12:638. Gn. 50:514. 

 A very variable species. Cosmopolitan in temperate 

 regions. An insidious weed in moist soil. The native 

 forms have been called C. interior, House, Rocky Mt. 

 region; and C. americanus, Greene, in the eastern 

 states, but are difficult to distinguish. Var. repens, 

 Gray (C. repens, Linn.). Pubescent: sts.. trailing or 

 sprawling: the basal lobes of the Ivs. obtuse or rounded. 

 Coastal region from Que. to Fla. 



AA. Calyx without bracts: peduncle 1-6-fld. (Eucon- 

 volvulus.) 



B. St. prostrate, trailing, glabrous or minutely pubescent. 



6. mauritanicus, Boiss. Strong perennial roots: st. 

 herbaceous, slender, prostrate, rarely branched, minutely 

 villose: Ivs. alternate, round-ovate, obtuse, short- 

 petioled: fls. blue to violet-purple, with a lighter throat, 

 1-2 in. across, very handsome. Afr. B.M. 5243. F.S. 

 21:2183. Gn. 39:52. A free bloomer through the 

 summer. On dry banks each plant forms a dense tuft 

 which throws up many graceful shoots. Not hardy 

 north of Philadelphia. 



7. Scamm6nia, Linn. Hardy perennial trailer, 

 deciduous: st. angular, glabrous: Ivs. cordate-sagittate, 

 gray-green, the lobes entire or dentate : sepals glabrous, 

 ovate, obtuse; corolla white, creamy or light pink. Asia 

 Minor. The large tap-roots supply the resinous 

 cathartic drug scammony. 



BB. St. erect or ascending, silky. 



8. Cnedrum, Linn. St. shrubby, half-hardy, 1-4 ft. 

 high: Ivs. persistent, lanceolate or spatulate, silky gray: 

 infl. a loose panicle, 1-6-fld.; fls. white or tinged with 

 pink, borne freely during the summer. S. Eu. 

 Valuable as a pot-plant for greenhouse or window 

 decoration, or trained to a warm wall. Confused with 



C. olesefolius. 



9. olesefdlius, Desr. Tender perennial: Ivs. linear- 

 lanceolate, acute, slightly villose: fls. bright pink, 

 borne freely in 



loose, umbellate 

 panicles in the 

 summer. Greece. 

 B.M. 289 (as C. 

 linearis) . Many 

 plants now pas's- 

 ing as C. olesefolius 

 are C. Cneorum. 

 The latter may 

 be distinguished 

 by its broader, 

 blunter, silvery- 

 villose Ivs., 

 lighter-colored 

 blossoms and 

 taller growth. 



10. tricolor, 

 Linn. (C. minor, 

 Hort.). Fig. 1049. 

 Hardy annual: st. 

 trailing, ascending 

 6-12 in., angulate, 

 densely covered 



with long brown- 1048. Convolvulus Sepium. 



