SEMPERVIVUM 



1878. Baker's scheme has been closely followed below, 

 but some of the names have been changed. 



SEMPERVIVUM 



1655 



anomalum, 7. 

 arachnoideum, 8. 

 arenariuin, 13. 

 Atlanticum, 4. 

 calcareum, 2. 

 Calif ornicum, 2. 



INDEX. 



expansum, 1. 

 flagelliforme, 6. 

 glaiicum, 3. 

 globit'erum, 12. 

 grandiflorum, 10. 

 Heuflfelii, 11. 



moiituimm, T). 

 pumiluiii, 7. 

 Rutlieiucum, 9. 

 sobuliferum, 12. 

 tectonira, 1. 

 tomentosum, 8. 



Subgenus I. Sempervivum Proper. Floral parts in 

 lO's, 13's or 14's. Expanded petals tvidely spreading. 



Division 1. Rhodanthm. Fls. reddish. 

 Group 1. Ciliata. Lvs. of the barren rosettes glabrous 

 on the faces when mature, shortly ciliated on the 

 edges only. 



A. Red-brown tip of lvs. conspicuous. 

 B. Foliage green or slightly glau- 

 cous 1. tectorum 



BB. Foliage very glaucous 2. calcareum 



AA. Red-brown tip of lvs. none or ob- 

 scure. 



B. Petals bright red 3. glaucum 



BE. Petals pale red 4. Atlanticum 



Group 2. Piibescentia. Lvs. of the barren shoots de- 

 cidedly pubescent on the faces as well as ciliated at the 

 edges, not tipped with a tuft of spreading hairs. 

 A. Height 6 in.: fls. numerous, the 



lowest subsessile 5. montanum 



AA. Height 3-4 in.: fls. few, 4-8, all 

 sessile or subsessile. 

 B. Sarren rosettes 1-1/i in. across: 



fls. bright red 6. flagelliforme 



BB. Barren rosettes 1 in. across at 



most: fls. mauve-purple 7. pumilum 



Group 3. Barbulata. Lvs. of the barren rosettes 

 strongly ciliated on the edge, and furnished with a 

 tuft of similar, not fleecy hairs at the cusp. {JYone 

 in our trade. ) 



Group 4. Arachnoidea. Differing 

 from the other groiips in having the 

 tips of the inner lvs. of the barren 

 rosette connected by fine fleecy threads 

 like those of a spider'' s web 8. arachnoideum 



Division 2. Chrysantha. Fls. yellow. 



A. Fls. less than 1 in. across: height 



6-12 in 9. Ruthenicum 



AA. Fls. V/i-VA in. across : height 



3-4 in 10. grandiflorum 



Subgenus II. Diopogon. Floral parts in 6's. Co- 

 rolla permanently bell-shaped, ivith ascending close 

 petals. 



A. Petals not fimbriated: young ro- 

 settes not pedtincled 11. Heuffelii 



AA. Petals fimbriated: young rosettes 

 temporarily attached to the 

 mother plant by a slender stalk. 



B. Lvs. obovate-cuneate 12. globiferum 



BB. Lvs. oblanceolate 13. arenarium 



1. tectdrum, Linn. Houseleek. Old-Man-and- Wo- 

 man. Fig. 2310. Height 1 ft. : rosettes 3-4 in. across : lvs. 

 obovate-cuneate, cuspidate, l>2-2 or finally 3 in. long, 

 pale green, with a distinct red-brown tip an eighth to a 

 sixth of an inch long: panicle 5-6 in. long, 3-4 in. wide, 

 composed of 10-12 scorpioid branches : fls. '%-! in. 

 across; petals pale red, keeled with deeper red; sta- 

 mens often changed to pistils; filaments bright purple. 

 Eu., Orient. — Var. expansum, Hort., is said to have 

 broader lvs. and more open rosettes. 



2. calcireum, Jord. {S. Californicum, Hort.). Height 

 under 1 ft.: barren rosettes 2 in. across: lvs. oblanceo- 

 late-cuneate, very glaucous, with a distinct red-brown 

 tip, \-\% in. long: panicle 3-4 in. long and broad, with 

 8-12 scorpioid branches: fls. % in. across; petals pale 

 red, greenish down the keel both on the back and face. 

 Calcareous Alps of Dauphiny. 



3. glaiicum, Tenore. Height 6-9 in. : barren rosettes 

 2-3 in. across: lvs. oblanceolate-cuneate, less glaucous 

 than (S. calcareum, with only a very faint red-brown 

 spot at the tip: panicles 2-3 in. across: fls. 1 in. across; 

 petals bright red. Simplon Alps. 



4. Atldnticum, Baker. Height nearly 1 ft. : barren ro- 

 settes 2-3 in. across: lvs. oblanceolate-cuneate, pale 

 green, hardly tipped red-brown: panicle 3-4 in. across: 

 fls. 1 in. across; petals pale red. Atlas Mts. B.M. 6055 

 (as .S'. tectorum, var. Atlanticum). — The lvs. of the 

 flowering stem are brightly colored with red, excepting 

 towards the base. 



v.vHyKVi: 

 2311. Spiderweb Houseleek— Sempervivum arachnoideum. 



(X^.) 



5. montanum, Linn. Height 6 in.: barren rosettes 

 lJ^-2 in. across, the new ones few, and borne on red 

 pilose peduncles 1-lK in. long: lvs. 60-80 in a rosette: 

 panicle very dense, 13^-2 in. across, the lowest fls. 

 nearly sessile: fls. 1-1 J^ in. across, bright mauve-red. 

 Fls. about the end of June. Alps, Pyrenees. 



6. flagellifdrme, Fisch. Height 3-4 in.: barren ro- 

 settes 1-1 >2 in. across, the new ones long-peduncled: 

 lvs. 40-50 in a rosette: fls. 6-8 in a dense head, all ses- 

 sile or nearly so, 1 in. across or more ; petals bright 

 red. Fls. early in June, before any other species. Na- 

 tive country uncertain. 



7. pilmilum, Bieb. (S. an6malu7n, Hovt.). Height 3- 

 4 in. : barren rosettes at most 1 in. across, the new ones 

 numerous and short-peduncled : fls. 4-8, in a dense 

 head, all sessile or subsessile, 1 in. across ; petals 

 bright mauve-purple. Fls. in middle of June. Cauca- 

 sus. 



8. arachnoideum, Linn. Cobweb or Spider-web 

 Houseleek. Fig. 2311. Height 3-5 in.: barren rosettes 

 H-% in. across, the new ones crowded and sessile: lvs. 

 oblong-cuneate, pale green, the tips of nearly all con- 

 nected by long, soft, white hairs: panicle dense, few- 

 fld.: fls. less than 1 in. across; petals bright red. Pj'- 

 renees to Tyrol. B.M. GS. — S. tomentosum, C. B. Lehm., 

 said to differ in having shorter, more obovate-cuneate 

 lvs. and flatter and more compact rosettes and a denser 

 web, could not be di.stinguished by J. G. Baker. R.H 

 1860, pp. 490, 491; 1898, p. 573. 



9. Ruthenicum, Koch. Height 6-12 in.: barren ro- 

 settes 1%. in. across, new ones few: lvs. 40-50 in a ro- 

 sette, slightly pubescent glandular on the faces: fls. 

 pale yellow, less than 1 in. across. Eastern Eu. — Rare 

 in cult. 



10. grandifldrum, Haworth. The yellow petals are 

 set off by the red-purple filaments : height 3-4 in. : bar- 



