SEXECIO 



SEXECIO 



3149 



the senecios are yellow-rayed. Of the vast number of 

 species, very few have gained prominence in horti- 

 culture. 



To Senecio belong the genera known to gardeners as 

 Jacobsea, Kleinia, and Cineraria. The latter is a 

 Senecio, although the florist's cineraria is described 

 under that name in Vol. I of this work. Bentham & 

 Hooker refer to Senecio the genus Cacalia, which is 

 kept distinct by American botanists. Hoffman (in 

 Engler & Prantl's Natiirl. Pflanzenfamilien) refers the 

 garden genus Emilia to Senecio, but keeps Ligularia 

 (including Farfugium) and Cineraria (not the florist's 

 cineraria) distinct. See Emilia; also Ligularia. 



If the greenhouse cineraria (which is technically a 

 Senecio as understood by Bentham & Hooker) is 

 omitted, the most popular species are S. mikanioides 

 or German ivy. 5. ekgans or purple ragwort, S. pulcher, 

 and 5. Cineraria, one of the plants commonly known 

 as dusty miller. Various other plants are known as 

 dusty miller, and one of them, Artemisia Stelleriana, is 

 sometimes confounded with Senecio Cineraria. Most 

 other species are of very minor importance to the horti- 

 culturist. Several species are found in the European 

 trade, and of the sixty or more species native to the 

 United States and Canada, about a half dozen have 

 been offered by dealers in native plants, but they are 

 practically unknown horticulturally. Most of the species 

 are wholly herbaceous, but in South Africa. Australia, 

 Central and South America many species are shrubby. 

 Some species are even arborescent ; others are climbers. 

 In South Africa and the Canaries is a small series of 

 species that has been separated as Kleinia, distin- 

 guished mostly by their habit, being for the most part 

 fleshy shrubs or herbs, with terete or angular stems 

 and whitish or pale yellow rayless flowers. Species of 

 this group are sometimes seen in collections of succu- 

 lents. S. vulgaris. Linn., from Europe, is a common 

 annual weed in various parts of this country. 



Since senecios afford both greenhouse and hardy 

 border plants, it is impossible to give general cultural 

 directions. The species are not difficult to manage, 

 however, and most of them propagate readily by means 

 of greenwood cuttings and seeds; the hardy species 

 may be divided. Most of the tender species require 

 coolhouse conditions. 



acanthi foli us, 25. 

 albidus. 9. 

 albus. 7. 



Antettphorbium, 1. 

 articulatus, 1. 

 aureo-marginatus,' 25. 

 aureus. 17. 

 auriculatissimus, 6. 

 Bolanderi, 16. 

 candidissimus, 25. 

 Cineraria, 25. 

 cruentus, 33. 

 Doria, 10. 

 Doronicum, 12. 

 Douglasii, 26. 

 elegans. 7. 

 erect us. 7. 



INDEX. 



exaltatus, 14. 

 Faberi, 18. 

 fastigiatus, 22. 

 Ghitsbreghiii, 29. 

 glastifolius, 28. 

 grandiflorus, 9. 

 grandifolius, 29. 

 Greyii, 24. 

 Henryi. 19. 

 Heritieri, 32. 

 Jacobasa, 20. 

 Kirkii, 28. 

 lugens, 13. 

 macroglossus, 5. 

 macrophyllus, 11. 

 magnificus. 27. 

 maritima, 25. 



mikanioides, 3. 

 Palmeri, 23. 

 pendula, 1. 

 Petasitis, 31. 

 Prainianus, 30. 

 pulcher, 8. 

 purpureug, 7. 

 radicans, 2. 

 saxifragoides, 15. 

 scandens. 3, 4. 

 spinulosa. 1. 

 fuspensa, I. 

 tanguticus, 19. 

 uniflorus, 21. 

 renuftus. 9. 

 Webberianus, 33. 



KEY TO THE SPECIES. 



A. St. and Irs. more or less fleshy: heads 

 rayless. 



B. LTS. flat, laciniate 1. articulatus 



BB. LTS. terete, unditided 2. radicans 



AA. St. and hs. not fleshy: heads rayless or 



radiate. 

 B. Habit climbing. 



c. Heads rayless 3. mikanioides 



cc. Heads radiate. 



D. Plants pubescent 4. scandens 



DD. Plants glabrous. 



E. Lrs. not conspicuously auricled 



at the base 5. macroglossus 



EE. Lts. conspicuously auricled at [mus 



the base. . . 6. auricula tissi- 



BB. Habit not climbing, 

 c. Annuals. 

 D. Lts. 13 cm. long, deeply pinnati- 



fid 7. elegaas 



DD. Lts. Jf-10 cm. long, lobate-dentate. 8. pulcher 

 cc. Perennials. 



D. Lts. pinnately veined. 

 E. The st. herbaceous: plants not 

 densely white-tomentose. 



F. Rays purple 9. grandiflorus 



FF. Rays yellow. 



G. All Its. undivided. 

 H. Plants glabrous: intolucral 

 bracts not black-tipped. 



I. LTS. glaucous 10. Doria 



n. Lrs. not glaucous 11. macrophyllus 



HH. Plants more or less pubes- 

 cent. 



I. Intolucral bracts black- 

 tipped. 



l. Pubescence floccose-woolly. 

 K. Lower hs. closely den- 

 tate 12. Doronicum 



KK. Lower Irs. remotely 



denticulate 13. lugens 



11. Pubescence of hirsute, 



jointed hairs 14. exaltatus 



n. Intolucral bracts not black- 

 tipped 15. saxifragoides 



QG. All Its. or some of them di- 

 vided. 

 H. St.-lts. once-pinnate. 



I. Height of plants 6 in. to 3 



ft.: basal Its. unditided. 

 i. Intolucral bracts 13, usu- 

 ally pubescent 16. Bolanderi 



II. Intolucral bracts 21, gla- 



brous 17. aureus 



n. Height of plants J^-7 ft.: 

 Its. all pinnatifld. 



i. Infl. corymbose 18. Faberi 



jj. Infl. paniculate 19. tanguticus 



HH. St.-lvs. 2-S-pinnatisecL 20. Jacobaea 



EE. The st. herbaceous or distinctly 

 woody: plants usually white- 

 tomentose throughout (some- 

 times glabrous inS. Douglasii). 



r. Heads solitary 21. uniflorus 



FF. Heads several to many. 

 G. Lrs. all unditided. 

 H. Shape of Its. oblanceolate. 



i. Sts. not leafy 22. fastigiatus 



n. Sts. leafy 23. Palmeri 



HH. Shape of Its. oblong to ovate; 



glabrous above 24. Greyii 



GG. Lts. all or some of them di- 

 vided. 

 H. Lf. -divisions broad, obtuse; 



bracteoles inconspicuous. .25. Cineraria 

 HH. Lf. -divisions narrow, acute; 



bracteoles conspicuous .... 26. Douglasii 

 EEE. The st. woody: shrubs or under- 



shrubs, not white-tomentose. 

 F. Length of Its. 3-5 in. 



G. Rays yellow 27. magnificus 



GG. Rays white 28. Kirkii 



FF. Length of Its. 6^-18 in 29. grandifolius 



DD. Lts . palmately veined. 



E. Heads rayless 30. Prainianus 



EE. Heads radiate. 

 r. St. woody. 

 G. Lts. 4^2O cm. broad: heads 



numerous 31. Petasitis 



GG. Lts. 1-3 cm. broad: heads 



solitary 32. Heritieri 



FF. St. herbaceous 33. cruentus 



1. articulatus, Schz. Bip. (Kleinia articulata. Haw.). 

 CANDLE PLANT. Plant branching, glabrous and fleshy, 

 1-2 ft. high, the branches s_wollen at intervals: Ivs. flat 

 and flesh}-, petiolate, laciniate or mncinate, with acu- 

 minate lobes: heads discoid and all the florets perfect, 

 white, in small corymbs on naked peduncles: achenes 

 downy. S. Afr. Perhaps the commonest kleinia in 

 cult., being grown with coolhouse succulents. S. 



