AN ENCYCLOPEDIA OF HORTICULTURE. 



103 



Gustavia continued. 



flowered, sub-umbellate. Leaves large, alternate, ovate or 

 spathulate, glossy. Gustavias thrive in a rich loamy soil. 

 Cuttings, made from ripened shoots, root freely if inserted 

 in sand, under a glass, in heat. 



G. gracillima (very slender).* fl. rose-red, 4in. in diameter, pro- 

 duced from the leaf axils in the young plants, from the wood in 

 old ones, solitary or in pairs ; peduncle stout, clavate, lin. to 

 2in. long. September. I. close-set, spreading and recurved, 

 acuminate, serrate, narrowed into a slender petiole, lin. to 2in. 

 long ; margin somewhat waved ; midrib prominent beneath. 

 Trunk slender, quite glabrous. New Grenada, 1845. (B. M. 6151.) 



G. insignia (remarkable).* fl., corolla very large, 5in. to 6in. in 

 diameter ; petals cream- white, concave, spreading, externally 

 tinged with rose-colour ; filaments rose ; anthers orange. June. 

 I. glossy, dark green, obovate-lanceolate, acuminated at the 

 point, much attenuated at the base, and sessile, or nearly so. 

 h. 3ft. to 4ft. Tropical America, 1858. (B. M. 5069.) 



G. pterocarpa (wing-fruited).* This is closely allied to G. 

 insiynis, but differs from it by the ovary being winged, the 

 smaller and white flowers, the comparatively large calycine lobes, 

 and the more coriaceous, nearly entire foliage. (B. M. 5239.) 



GUTIERREZIA (meaning probably commemora- 

 tive). SYNS. Brachyris and Brachyachiris. OED. Com- 

 positce. A genus comprising about twenty species of 

 erect herbs or sub-shrubs, peculiar to America, extending 

 from the Red Kiver to Mexico ; a few also occur in 

 Chili and the extreme South of the continent. Flower- 

 heads yellow, small, very numerous, arranged in corymbs 

 at the ends of the twigs. Leaves linear, entire, gummy. 

 The species are of botanical interest only. The plant 

 grown in gardens under the name of G. gymnosper- 

 moides is now referred to the genus Xanth.ocepn.alum 

 (which see). 



GUTTA-PERCHA-TREE. See Isonandra. 



GTJTTIPER.ZE. A natural order of trees or shrubs, 

 with a resinous juice, natives of humid and hot places 

 in tropical regions, chiefly in South America or Asia, 

 while a few are found in Africa. Flowers white, yellow, 

 or pink, often incomplete ; sepals and petals two to six, 

 rarely eight. Leaves opposite, leathery, entire. The 

 plants are generally acrid, and yield a yellow gum-resin. 

 There are about twenty-four genera and 230 species. 

 Illustrative genera are : Calophy Hum, Clusia, Garcinia, 

 and Mammea. 



GUZ MANIA (named in honour of A. Guzman, a 

 Spanish naturalist). OED. Bromeliacece. A genus of 

 four or five species of very handsome stove herbaceous 

 perennials, allied to Tillandsia (which see for culture). 

 They are all natives of tropical America. 



G. Devansayana (Devansay's). fl. white, tightly packed within 

 broad, acuminate, scarlet bracts. I. dilated at the base, purple- 

 striped. Ecuador. (B. H. 1883, 8, 9.) 



G. erythrolepis (red-scaled).* fl. white ; the uniform purplish- 

 red colour of the bracts distinguishes this at once from G. tricolor. 

 I. deep green, like those of G. tricolor. (F. d. S. 1089.) 



G. fragrans (fragrant). A synonym of Canistrum eburneum 



G. tricolor (three-coloured).* fl. pure white ; scape erect, 1ft. to 

 2ft. long, clothed with numerous bracts of a bright pale yellow 

 green, beautifully streaked with blackish-purple towards the top, 

 tipped with red, and at the extreme apex rich scarlet. Summer. 

 I. rosulate, broad-linear, sword-shaped, involute, concave, sheath- 

 ing at the base, lift, long, rich green. 1820. (B. M. 5220.) 



G-YMNADENIA (from gymnos, naked, and aden, a 

 gland ; the glands of the pollen masses are naked). OED. 

 Orchidece. Pretty terrestrial orchids, now referred to 

 Habenaria (which see). 



GYMNEMA (from gymnos, naked, and nema, a fila- 

 ment ; the stamineous corona being absent, the filaments 

 are left naked). OED. Asclepiadeoe. A genus com- 

 prising about twenty-five species of stove evergreen 

 climbing shrubs or sub-shrubs, natives of Africa, tropical 

 and sub-tropical Asia, and Australia. Flowers yellow, 

 small. Leaves opposite. The plants thrive in a well- 

 drained compost of fibry loam and sandy peat. Cuttings 

 of firm side shoots, made in spring, will root if inserted 

 in sand, in heat. 



Gymnema continued. 

 G. lactiferum (milk-bearing), fl. in umbels, shorter than the 



petioles ; throat of small corolla crowned by five fleshy tubercles. 



July. I. on short petioles, ovate, bluntly acuminated, usually 



unequal-sided. Tropical Asia. The milk of this plant is sub- 



stituted by the Cingalese for cows' milk. 

 G. tingens (staining). fl. pale yellow, numerous ; umbels or 



corymbs often twin. July. I. cordate, acuminated, to oval. 



Tropical Himalaya, 1823. 



GYMNEMA (of Rafinesque). A synonym of Pluchea 

 (which see). 



GYMNOCLADUS (from gymnos, naked, and Tclados, 

 a branch; in reference to the naked appearance of the 

 branches during winter). Kentucky Coffee - tree. OED. 

 Leguminosce. A monotypic genus. The species is a very 

 ornamental hardy deciduous tree. It thrives in a shaded 

 situation, and in a rich, deep, free soil. Propagated by 

 cuttings, made of the roots; or by imported seeds. The 

 name Coffee-tree comes from the fact of its seeds having 

 been used as a substitute for coffee by the early settlers. 

 G. canadensis (Canadian).* fl. white, disposed in terminal 



simple or thyrsoid racemes. May to July. I. bipinnate, with 



to seven pairs of pinnae, the lowest pair bearing single 

 leaflets, the rest bearing six to eight pairs of leaflets, h. 30ft. to 



four 

 leafl 

 60ft. Northern United States, 1748. 



GYMNOGRAMME (from gymnos, naked, and 

 gramma, writing; referring to the spore cases). In- 

 cluding Ceterach (in part), Dictyogramme, Grammitis (in 

 part), Pterozonium, Selliguea, and Trismeria. OED. 

 Filices. A genus consisting of about a hundred species 

 of (except where otherwise stated) beautiful stove 

 Ferns. Sori arising from the veins over the under 

 surface of the frond, linear or linear-oblong, simple 

 or forked. Those species which have the under surface 



FIG. 158. FROND OF GYMMOUKAMME CALOMELANOS CHRYSOPHYLLA. 



