72 



THE DICTIONARY OF GARDENING, 



Glaucinm continued. 



G. phceniceum (purple).* ft. crimson, with a. black spot at 

 the base of each petal. June. I. oblong, pmnatifld, hairy. 

 h. 9in. England (probably naturalised). SYN. G. eorniculatum. 

 (Sy. En. B. 65.) 



GLAUCOUS. Covered with a fine bloom. 

 GLAUX (the name given by Dioscorides to another 

 plant ; from glaulcos, greyish-green). Black Saltwort ; Sea 

 Milkwort. OBD. PrimulacecB. A pretty little herbaceous 

 perennial, rarely seen in gardens. It thrives in a moist 

 sandy soil, and may be propagated by seeds. 

 G. maritima (sea), ft. of a pale pink colour, not two lines long, 

 solitary, nearly sessile and axillary ; corolla wanting ; calyx deeply j 

 ttve-lobed. Summer. I. small, mostly opposite, sessile, ovate, 

 oblong or almost linear, entire, h. Sin. to 6in. Europe (Britain), 

 North and West Asia, and North America, on sands, salt-marshes, 

 and muddy places, near the sea. (Sy. En. B. 1150.) 



GLAZING. Numerous systems of Glazing have, of 

 late years, been invented and patented, all being chiefly 

 directed against the use of putty, and professing to offer 

 advantages over the ordinary method, such as cheapness 

 in construction, durability, the admission of additional 

 light, and special facilities for repairing broken glass. 

 Although some of these methods are largely adopted, and j 

 answer well in the case of extensive glass buildings, their | 

 use for horticultural purposes is by no means general. 

 One of the best patent systems introduced is that known 

 as Eendle's, in which the panes of glass are fitted at the 

 top and bottom into horizontal grooves formed of bent 

 zinc, and are slightly lapped on each other at the sides. 

 The zinc grooves are made to conduct the water down 

 the roof from the outside, and also that caused by con- 

 densation underneath. This renders the structure re- 

 markably free from drip inside, which is an important 

 consideration. No putty is used, and the plan answers 

 equally well either with straight or curvilinear roofs, the 

 glass being kept in place by indiarnbber wedges. Various 

 other modes are recommended by different makers, some 

 having strips of felt along the sides of the panes, and a 

 metal ridge on each rafter, screwed on the felt sufficiently 

 close to hold all firmly underneath. The use of putty is 

 requisite with sashes that are movable, either as ven- 

 tilators or for covering frames, to prevent the glass 

 shaking out or becoming displaced. In Glazing, the 

 panes may vary in size, according to the dimensions of 

 the house or pit. Unless the roof be very flat, the laps 

 should not exceed fin., and they should be made as air- 

 tight as possible, each pane being secured in position 

 before the putty is put on by small pieces of zinc made 

 for the purpose. The larger the panes are, the more 

 light do they admit ; but a length of 2ft. or 3ft. must 

 be an outside limit, with a width not much exceeding 1ft. 

 Great pressure is put on the surface of glass houses 

 by rough winds, and by snow in winter ; and, in order to 

 withstand this, the quality of the glass and proper Glazing 

 must be insured in the first instance. 



GLAZIOVA. Included under Cocos (which see). 



GLECHOMA. Now included under Nepeta (which 

 see). 



GLEDITSCHIA (named after Gottlieb Gleditsch, of 

 Leipsic, 1714-1786, Director of Botanic Gardens at Berlin). 

 SYN. Gleditsia. OBD. Leguminosce. A 'genus comprising 

 about half-a-dozen species of ornamental, mostly hardy, 

 deciduous trees, inhabiting temperate or sub-tropical 

 Asia and North America (one of them tropical African). 

 Flowers greenish, disposed in spikes. Leaves abruptly 

 pinnate and bipinnate on the same tree. Branches supra- 

 axillary, frequently converted into branched spines. The 

 species are of easy culture in almost any soil. Propa- 

 gated by seeds, obtained from their natural habitats, and 

 sown in March, about lin. deep. 

 G. horrida (horrid). A synonym of G. sinennt. 

 G.' monosperma (one-seeded). Water Locust, ff. greenish. 



Summer. /., leaflets ovate-oblong, acute ; spines slender, few, 



usually triad, h. 30ft. to 40ft. United States, 1723. 



Gleditschia continued. 



G. slnensis (Chinese), fl. greenish. Summer. I., leaflets ovate- 

 elliptic, obtuse; spines robust, conical, rameal ones simple or 

 branched, cauline ones in fascicles, branched. A. 30ft. to 50ft. 

 China, 1774. SYN. G. horrida. 



G. trlacanthos(three-spined).* Honey Locust, /.greenish. Sum- 

 mer. 1., leaflets linear-oblong, lucid ; spines robust, compressed 

 at the base, but cylindrically conical at the apex, simple or tritid. 

 h. 30ft. to 50ft. United States, 1700. There are several varieties 

 of this fine tree, including an unarmed one, also one with a pen- 

 dulous habit. (W. D. B. ti. 138.) 



GLEDITSIA. A synonym of Gleditschia (which 



see). 



GLEICHENIA (named in honour of W. F. Gleichen, 

 1717-1783, a German botanist). OBD. Filices. A genus 

 comprising about thirty species of ornamental stove and 

 greenhouse ferns. Oaudex mostly creeping. Fronds rarely 

 unbranched, generally dichotomously divided; pinnae 

 deeply pinnatifid, with the segments small and concave. 

 Sori of few (usually two to four) sessile capsules, situated 

 on a lower exterior veinlet. For general culture, see 

 Ferns. 



G. acutifolia (acute-leaved). A synonym of G. quadripartita. 

 G. Bancroft!! (Bancroft's). A synonym of G. Imiyissima. 

 G. bifurcata (twice-forked). A synonym of G. flayellaris. 

 G. bracteata (bracteate). A synonym of G. 



FIG. 112. GLEICHENIA CIRCINATA. 



G. circinata (circinate). * fronds, lobes of the pinna? ovate or 

 sub-rotund, more or less glaucous beneath, the margins slightly 

 recurved ; branches and rachis glabrous, or more or less pu- 

 bescent. Capsules three to four, superficial. Australia. Green- 

 house. See Fig. 112. SYNS. G. microtihylla, G. spelimctr. The 

 variety semi-vestita has the rachises and young fronds very 

 paleaceo-pubescent. See Fig. 113. 



G. cryptocarpa (hidden-fruited), fronds proliferous, coriaceous, 

 deep yellow or yellow-brown when dry ; branches dichotomously 

 flabelliform ; pinna? broad-lanceolate, sub-erect and compact, 4in. 

 to 5in. long, lin. broad, pectinato-pinnatifid ; segments narrow- 

 linear, strongly veined, the margins singularly rerolute, conceal- 

 in? the sori. Capsules one to four in a sorus. h. 3ft. Chili, 1865. 

 Greenhouse. 



G. Cunningham! (Cunningham's), fronds often proliferous, cori- 

 aceous ; branches dichotomously flabelliform, glaucous beneath, 

 hairy ; pinna; linear-lanceolate, acuminate, 4in. to 6in. long, iin. 

 to lin. broad ; segments linear, acute. Capsules two to four 

 in a sorus. New Zealand. Greenhouse. (H. S. F. i. 6a) 



G. dlcarpa (two-fruited).* fronds, lobes of the pinna? round, sub- 

 hemispherical, very fornicate. Capsules two, concealed within 

 the almost slipper-shaped lobes, and mixed with ferruginous, 

 paleaceous hairs, which often extend to the rachis. Australia. 

 A variable greenhouse species. (II.S.F.i. lc.) i The variety alpina 

 is generally smaller and more compact, rachis and younc shoots 

 ferruginous with paleaceous wool. SYN. G. hccistophylla. (H. S. F. 

 i. 2B.) Another elegant variety, introduced in 1879, is longipin- 

 nata, in which the fronds are longer than those of the type, 

 and the growth is exceedingly graceful. 



G. dichotoma (forked).* sti. zigzag, repeatedly di- or trichoto- 

 mous, the ultimate branches bearing a pair of forked pinna?, 

 about Sin. long and 2iu. wide ; segments never decurrent, glau- 



