1130 



ERICA 



sunlight can be had. They should be wintered in a 

 greenhouse extremely well ventilated, and a tempera- 

 ture not higher than 40 to 45 F. When in bud the 

 plants should not be allowed to dry out too much. One 

 drying might be enough to cause the loss of all the buds. 

 Very often the heaths are attacked by a disease similar 

 to mildew, brought on by an excess of humidity in the 

 air. As this disease is very contagious, it is well, as soon 

 as noticed, to use sulfur in powder or sulfate of copper 

 in solution until the plants are rid of it (Louis Dupuy) . 



INDEX. 



KEY TO THE SPECIES. 



A. Heaths hardy, European, or hardy 

 with protection from New York 

 southward. 



B. Lvs. and calyx -segms. ciliate: sta- 

 mens included. 



c. Fls. in spike-like clusters 1. ciliaris 



cc. Fls. in umbel-like clusters 2. Tetralix 



BB. Lvs. and calyx-segms. glabrous. 

 c. Anthers usually exserted well 



beyond the corolla-tube. 

 D. Fls. usually solitary and lat- 

 eral, rose-colored^ 3. mediterranea 



DD. Fls. clustered, pink, usually 



all lateral 4. carnea 



DDD. Fls. all clustered at the ends of 



the branches 5. vagans 



cc. Anthers included in the corolla- 

 tube. 

 D. Fls. rose-violet or purplish. 



E. The Ivs. verticillate in S's... . 6. cinerea 

 EE. The Ivs. verticillate in 4's. . . 7. stricta 

 DD. Fls. pale rose, in broad 



panicles 8. lusitanica 



AA. Heaths tender, S. African, always 



grown under glass in Amer. 

 B. Fls. mostly showy, petal-like, 



scarcely greenish or sepal-like. 

 c. Corolla tubular, the limb not 



spreading. 



D. Length of fls. usually more 

 than 6 lines, in cult, speci- 

 mens umbellate 9. verticillata 



DD. Length of fls. usually 1012 



lines, in 2' s or 8' s 10. hyemalis 



cc. Corolla various, not tubular, the 



limb often spreading. 

 D. The corolla-segms. spreading, 



the tube mostly elongate. 

 E. Length of corolla 6-8 lines; 



segms. ovate, acute 11. ventricosa 



EE. Length of corolla 3-4 lines; 

 segms. ovate or sub-orbic- 

 ular 12. praestans 



DD. The corolla-segms. usually not 

 spreading, the tube rarely 

 over 4 lines long. 

 E. Lvs. channeled. 



F. The Ivs. in S's 13. sicaefolia 



FF. The Ivs. in 4's 14. propendens 



EE. Lvs. not channeled, more or 

 less open-backed and 

 spreading. 



F. Infl. variable, often ter- 

 minal and axillary on 



the same plant 15. flacca 



FF. Infl. always terminal. 



o. Sepals about as long as 



the corolla-tube. 

 H. Lvs. rough or tuber- 



culate 16. turrigera 



HH. Lvs. not rough. 



i. The Ivs. glabrous... 17. gracilis 

 ii. The Ivs. usually 



pubescent 18. persoluta 



GG. Sepals about half as 

 long as the corolla- 

 tube 19. formosa 



BB. Fls. not so showy, calyx-like, the 

 calyx often colored also. 



c. Lvs. in S's: sepals colored 20. melanthera 



cc. Lvs. opposite: sepals green 21. fragrans 



1. ciliaris, Linn. A much-branched nearly hardy 

 shrub, 10-20 in. tall, the branches usually glandular: 

 Ivs. small, but not as in typical heaths, ovate, mucro- 

 nate: fls. about 4 lines long, or more, purplish, in spike- 

 like, lateral clusters. Eu. June-Sept. B.M. 8443. 



2. Tetralix, Linn. BELL HEATHER. CROSS-LEAVED 

 HEATH. Lvs. in 4's, margin folded back: fls. rosy; 

 sepals ovate-lanceolate, ciliate; anthers awl-shaped or 



awned, included; ovary with 

 short, soft hairs. W. Eu. Foli- 

 age grayish. Height in England 

 6-12 in. With Manning, at 

 Reading, Mass., about 8 in. 



3. mediterranea, Linn. (E. 

 cdrnea var. occidentalis, Benth.). 

 Fig. 1411. This is considered by 

 Bentham a western form of E. 

 carnea (No. 4), with a little 

 smaller fls., corolla a trifle wider 

 at the apex, and anthers shortly 

 exserted instead of included. E. 

 mediterranea of the trade is 

 hardy in England, and perhaps 

 second only to E. carnea in 

 popularity there. In Amer. it 

 seems to be cult, only under 

 glass but should be hardy from 

 N. Y. southward with protec- 

 tion. B.M. 471. Gn. 54:263; 

 55, p. 403; 61, p. 431. G.M. 

 45:261; 55:315. Var. alba, a 

 white-fld. form is known. Gn. 

 59, p. 94. 



4. carnea, Linn. (E. herbacea, Linn.). Height 6 in.: 

 Ivs. in 4's: infl. lateral; corolla broadly bell-shaped; 

 anthers exserted; ovary glabrous. March-May. Alps. 

 L.B.C. 15: 1452. B.M. 11. Gn. 54:6 (a charming 

 picture). The bright rosy-fld. form is the best and 

 most striking. There are pale red and pure white varie- 

 ties. The most popular of all hardy ericas. Very easily 

 prop, by division. E. mediterranea var. hybrida, Hort., 

 is said to be a cross with E. carnea, and in England 

 thriving almost as well in loam as in peat. See Gn. 

 54:262; 55, p. 127; 61, p. 399; 72, p. 176. G.M. 50: 

 39. J.H. III. 51:293. 



5. vagans, Linn. CORNISH HEATH. Fig. 1412. Lvs. 

 in 4's or S's: sepals small, ovate, obtuse; corolla ovate- 

 bell-shaped; anthers ovate-oblong, 2-parted, exserted; 

 ovary not hairy. W. Eu. and Medit. Fls. pale pur- 

 plish red. Grows 3-4 ft. in England; 1 ft. with J. W. 

 Manning, Reading, Mass. Var. alba has white fls. 

 Var. capitata, grows 1-2 ft. high with Meehan at Ger- 

 mantown, 'Pa., and has "small whitish fls. with a 

 purplish tip." F.E. 22:685. 



6. cinerea, Linn. A twisted and much-branched 

 shrub, 8-15 in. high: Ivs. verticillate, in 3's, narrow, 

 glabrous, and usually not over 3 lines long: fls. showy, 

 rose-violet, in usually verticillate clusters; corolla much 

 contracted at apex, the lobes reflexed. June-Sept. Eu. 

 Var. alba, Hort., a white-fld. form, and var. coccinea, 

 Hort., a scarlet form, are both in the trade. Gn. 61, p. 



1411. Erica mediterranea. 



