AN ENCYCLOPEDIA OF HORTICULTURE. 



489 



Draba continued. 



they become very effective. They should be placed in 

 the sunniest aspect on a rockery; the more effectually 

 the plants are matured by the autumn sun, the more 

 freely will they return these favours by an abundant 

 bloom in early spring." 



The perennials may be propagated by dividing at 

 the roots ; the annuals or biennials by seeds, which should 

 be sown in ordinary garden soil, in the open border, in 

 spring. Many of the strictly annual species may be 

 made biennial by sowing seeds too late to. allow the 

 plants to flower the first season. Perennials, except 

 where otherwise stated. 



D. alzoldes (Aizoon-like).* /. yellow ; scapes naked, smooth ; 

 stamens about the length of the petals. March. I. lanceolate- 

 linear, keeled, ciliated. A. 2in. to Sin. Europe (South Wales). 

 (Sy. En. B. 138.) 



D. Aizoon fAizoon).* fl. bright yellow; scapes naked, villous. 

 April. I. linear, acutish, keeled, stiff, ciliated, h. 3in. Moun- 

 tains of Western Europe, 1819. SfN. D. ciliaris. 



D. alpina (alpine).* fl. golden-yellow, a little smaller than those 

 of I), aizoides; scapes naked, pubescent. April. I. lanceolate, 

 flat, pilose, with branched hairs, h. 3in. Northern Europe, 1816. 



D. aurea (golden), fl. yellow ; petals obovate, blunt, clawed. 

 May. I. oblong-linear, acute, entire, pubescent. Stem leafy, 

 somewhat branched, velvety, h. bin. Greenland, 1824. Biennial 

 (B. M. 2934.) 



D. brunilfolia (Brunia-leaved). fl. yellow; petals twice the 

 length of the calyx and stamens ; scapes naked, pubescent 

 June. I. linear, somewhat keeled, ciliated, acute, loosely roaulate. 

 h. 4in. Caucasus, 1825. Plant loosely tufted. (B. Q. 780.) 



D. ciliaris (hair-fringed). A synonym of D. Aizoon. 



D. clnerca (grey), fl. white. Early spring. 1. oblong-linear, 

 entire ; stem leave 

 somewhat pubescent. 



D. cuspidata (cuspidate), fl. yellow ; scapes naked, villous. 

 Spring I. linear, acutish, keeled, ciliated. X. Sin. Tauria, 1821. 

 Closely allied to D. Aizoon. 



D. glacialis (icy).* fl. bright golden-yellow j scapes naked, 

 covered with starry pubescence. May. 1. linear - lanceolate, 

 entire, hispid with stellate hairs, h. 2in. Siberia, 1826. Closely 

 allied to D. aizoides, but differing from it in having a few- 

 flowered stem, and pedicels which are shorter than the pod. 



D. lapponica (Lapland), fl. white; scapes naked, very smooth. 

 May. 1. lanceolate, quit* entire, rather pilose. A. 2m. or 3m. 

 Alps of Lapland, 1824. 





ey). fl. white. Early spring. I. oblong-linear, 

 aves five or six, entire, scattered. Stem leafy, 

 scout. A. Sin. to 6m. Siberia, 1820. Biennial. 



FIG. 679. DKABA MAWII. 



D Mawli (Maw's)* fl. fin. in diameter; sepals very con- 

 ca DriTtly at the back, green, tipped with red-brown; petals 

 thre4 times as large as the sepals, obovate - cuneate retuse. 

 spreading, quite white. Spring. 1. linear-oblong, obtuse, shining ; 

 margin pectinate, with rigid incurved or spreading bristles 

 under surface with a prominent midrib Spam 18f3. An ex- 

 cellent rock plant, forming low densely - tufted bright -green 

 patches. See Fig. 679. (B. M. 6186.) 



D ni vails (snowy)* fl. white; scapes naked or one-leaved, 

 sShTApriL^: oblong-linear.' ciliated and somewhat pilose. 

 h. lin. or 2in. Arctic Europe, 1820. Habit more compact than 

 D. lapponica. 



Europe. SVN. PetrocaUu yyrenaica. (B. M. 713.) 



Draba continued. 

 D. Sautert (Sauter's). fl. yellow; scapes smooth. Spring L 



spathulate, stiff, ciliated, h. 4in. Switzerland. 

 D. tr Identata (three-toothed), fl. yellow ; scapes naked, smooth. 

 August. I. obovate, narrowed at the base into the petiole, three- 

 toothed at the apex, hairy. A. 3m. Caucasus, 1858. 

 D. vlolaoea (violet).* fl. deep violet-purpl*. J. opposite, ovate, 

 downy. Stem suffruticose, branched, diffuse. A. 6in. to 12in. 

 Quito Andes, 1867. 



DB.AC2ENA (from drakaina, a female dragon; the 

 inspissated juice becomes a powder, like dragon's blood). 

 SYNS. Pleomele, Terminalit. OUD. Liliacece. A genus of 

 about thirty-fire species of ornamental stove foliage plants, 

 widely dispersed over the tropics. Flowers generally 

 fascicled in panicles, in a few species in dense sessile heads 

 or oblong spikes. The differences between Cordyline and 

 Dracaena (the two genera having been much confused in 

 gardens) reside principally in the fruits, Ac. The flowers 

 of Dracaena are generally larger than those of Cordyline, 

 and the cells of the ovary in the latter genus contain 

 many ovules, whilst in Dracana they generally contain 

 but one. 



Propagation. Dracaenas, and the large group of plants 

 grown as such, but which properly belong to the genus 

 Cordyline, are easily and rapidly increased by cutting 

 up the stems of old plants, in pieces lin. or 2 in. long, 

 and placing them, at any season, in cocoa-nut fibre, or 

 light soil, in the bottom heat of a propagating house. 

 The tops of the plants will strike as cuttings, and the 

 fleshy base of the stem may also be occasionally re- 

 moved, and utilised for propagation. Young plants are 

 toon obtained from the latter, and from almost every 



