An Encyclopedia of Horticulture. 



11 



JLcer— continued, 

 A, Semenovi (Semenov's).* A slender and peaceful species, with 



leaves closelv reseniblmg those of A. Ginnala, but smaller. 



Turkestan, 1879. 

 A. sempervirens (evergreen). Synonymous with A. hctcro- 



phulbun. 

 A. spicatum (spiked). Synonymoxis with A. montanum. 

 A. striatum (striated). Synonymous with A. pcnn-mlvanicum. 

 A. tartaricum (Tartarian).* Jl. white, on crowiled, erect, coni- 



ponnil racemes. May. I. luore or less ci>rdate, acuminated, 



serrated, with obsolete lobes, h. 20ft. 1759. This species is 



one of the first to expand its leaves in spring. 

 A. tomentosum (tomentose). Synonymous with A. dasijcarpum. 

 A. tripartitum (three-parted). Synonymous with A. glahrum, 



A. Van Volxemii (Van Volxem's). ft. not known in Knaland. 



I. palinately tliree to tive-lobed, very large, lii;ht £,nofii above, 



silviiy and (piite glabrous beneath. Caucasus, 1877. Distinct 



and fine. 

 A, villosum (hairy). Jl. fragrant, on lateral racemes. April. 



Buds, fruit, and young leaves, silky, villous. I. cordate, fivedobed, 



villous beneath as well as the petioles ; lobes ovate acute, h. 50ft. 



Himalaya, at high elevations. Not hardy. 

 A. Virginianum (Virginian). Synonymous with A. dasycarpum. 



ACEBiACEJEi. An order of very ornamental hardy 

 trees, of which the sycamore and maple are well-known 

 representatives. 



ACERAS (from a, withont, and Iceras, a horn ; the lip 

 bavinj^: no spur). Ord. Orrhidarew, An interesting' genus 

 of terrestrial orchids. Calyx of three ovate, equal, con- 

 verging- sepals ; petals two, narrow, oblong ; lip spurless, 

 much longer than the calyx, narrow, oblong, with four linear 

 lobes. The most interesting species is the native one. 

 Indigenous to dry, chalky pastiires in the south-east of 

 England, and it will only thrive in similar soils when grown 

 in gardens. Propagated by careful divisions of tubers 

 only. 



Fig. 10. Flower of Aceras ANTimopopnoRA. 



A. anthropophora (Tlie (Ireen Man Orchis). jl. jn^eenish, 

 on a Ion;; spike, lip lonj^er tlian the ovaiy ; lip and petals 

 often niargiiifd witli red. June. I. lanceolate. /;. 1ft. See 

 Fig. 10. 



ACERATIUM (from a, not, and kerns, a horn; the 

 stamens being destitute of the terminal bristles so con- 

 spicuous in its near ally, ElcFocarpus). Ord. Tiliacece. An 

 interesting stove evergreen tree, very closely allied to Tilia. 

 It thrives well in a mixture of loam and peat, and is in- 

 creased by rii)e cuttings, which root readily if placed in 

 sand, under a hand glass, in heat. 



A. oppositifolium (oppositedeaved).* Jl. white, on terminal 

 three-flowered peduncles. June. I. opposite, elliptic-oblong, 

 furnished with a few nmcronated teeth, h. 20ft. Ambovna. 

 1818. 



Needle-pointed, fine, and 



ACEROSE. ACEROSUS. 



slender, with a sharp point. 



ACETARIOUS. An adjective applied to plants used 

 in salads. 



ACEUS. A termination expressing a resemblance to 

 the tiling wdioso name it terminates — fuliaceuSj leaf-like, 

 of tbe texture of a leaf or J'uli intt. 



ACHANIA. N"^ Malvaviscus. 



ACHENE. A hard, dry, one-seeded, superior seed- 

 vessel, 

 ACHERONTIA ATROPOS. SV ' Sphinx Atropos. 



ACHIIiLEA (named after Achilles, who is said to have 

 first discovered the medicinal qualities of this plant). In- 

 cluding Ptarmira. Milfoil. Ord. Composifte. A large 

 genus (about fifty species), containing numerous hardy, 

 border and alpine plants. Flower-head:^ small, corymbose ; 



A.ch.illeti— cotUiiLued. 

 invohicral scales oblong, often with a shrivelled appear- 

 ance ; receptacle with membranous scales, resembling 

 chaff; ray florets few, sometimes ratber large and showy; 

 pappus none. Leaves ternate, simple or compound. All 

 the species are easily ciiltivated in ordinary garden soil. 

 A, Eu'pntorimn and other large-growing kinds are well 

 suited for borders or groups, whilst the alpine section 

 should be planted on the rockery. A great number of 

 species, althciigh excellent for naturalising in rough 

 shrubberies, are totally unfitted for garden culture. Propa- 

 gated, during spring, by root divisions, cuttings, and seeds. 



A, segyptiaca (Egyptian).* J1. -heads rich bright yellow, in closely 



packed terminal corymbs, which are from 2in. to 4in. across. 



Sununer. I. pinnate ; leaflets obtusely lanceolate, serrate, silvery 



white, 6in. to Sin. long. k. l^ft. to 2ift. Levant, 1640. Handsome 



perennial, thriving best in a warm position. 

 A. Ageratum (ageratum- leaved).* ji.-hcads pure white, large, 



borne singly on stalks about 6in. or Sin. high. Summer. I. narrow, 



arranged in a dense silvery rosette, the margins prettily crimped. 



Greece. A pretty alpine, of comjiact habit. 

 A. asplenifolia (aspIfniumdeaved).*"/.-/jm(fsrose-coloured, small, 



iuaroiiipuinid r<.ryriili. June to Septendier. I. lower ones stalked, 



piniiatifiil, lol.ts pinnate; upper ones pinnate. /(. ISin. North 



America, 1803. 

 A, atrata (black-cupped).* Jl. -heads -whit^, August I. in a rosette, 



pinnatifid, deep sliiniug green. Au.stria, 1596. A pretty alpine. 

 A. aurea (golden-flowered).* jL-heads gv\i\e\\ yellow, borne singly 



on stems 18in. high. Summer and autumn. I. larger tlian in A. 



aneraiiJolUij with which species it is sometimes confused. Levant, 



1739. Habit tufted. Requires a warm position. 



Fig. 11. Achillea llavk.nn.e, showin* 

 Flower-lieads. 



Habit and detached 



A. Clavennse (Clavenna's).* Jl.-hcads white, in neat and compact 

 heads Sprim; and summer. I. bi-piimatitid ; sc-iuents linear, 

 obtuse, slitihtiv denticulated at the apex. A. lOin. Austria, 1656. 

 A very neat aiul pretty species, having dwarf tufted lialpit and a 

 hoary appearance. See Kig. 11. 



A. decolorans (staining). Jl.-heads whitish yellow. July. I. un- 

 divided, h. 1ft. Native comitry unknown. 1798. 



^^ 



Fio. 12. AciirLLEA Kui'AiuitiiiiM, slii'whig llaliit and detached 

 Flowerdiead. 



A. Kupatorium (fern-leaved).* jl.-hvada brilliant yellow, in dense 

 convex, rniii|ioiiiid corynilis, \\hich are often 5in. across, lasting 

 two iiiMjitlis ill lidl bi'aiity. .lune to September. /. numerous, 

 linear, piiuiatt.-. lohed and" serrated, hairy, rougb. h. 4ft. to 5ft. 

 Cauca.sus, 1803. This noble plant should be grown at the back of 

 tile border, and kept neatly stakeil. SVN. A. Jilipcndula. See 

 Fig. 12. 



A. filipendula (dropwort-leaved). Synonymous with A. Enpa- 

 tariuin. 



