202 



THE DICTIONARY OF GARDENING, 



Isomeris continued. 



best in a compost of sandy loam and leaf mould. Pro- 

 pagated in autumn, by cuttings of ripe shoots. 

 I. arborea (tree-like). JL yellow, large, in terminal racemes; 

 petals four, equal, sessile. May. I. tnfoliolate, lanceolate, mu- 

 cronulate, glabrous. Stem thick, very knotty. A. 10ft. Cali- 

 fornia, 1839. (B. M. 3842.) 



ISONANDRA (from isos, equal, and aner, andros, 

 the stamen; number of fertile and barren stamens equal). 

 OBD. Sapotacece. A genus comprising six species of 

 glabrous or pubescent milk-bearing trees, natives of 

 India and Ceylon. Flowers small, inconspicuous, pro- 

 duced in little clusters, either in the angles of the leaves 

 or at the ends of the young branches. Leaves entire, 

 leathery. The species described below is a stove evergreen 

 tree, of great commercial value and utility. It thrives in 

 a compost of sandy peat and fibry loam. Increased by 

 cuttings, inserted in sandy soil, under a bell glass, in 

 heat. 



I. gntta (Gutta). Gutta-percha Tree. ft. inconspicuous, dis- 

 posed in small axillary or terminal clusters. I. entire, coriaceous. 

 Borneo, 1847. The correct name of this tree, which yields the 

 well-known Gutta-percha of commerce, is Diehopsis gutta. 



ISOFLEXIS (from isos, equal, and plelco, to plait; 

 the upper segment of corolla is equal in length to the 

 lip). STN. Callianassa. OBD. Scrophularinece. A genus 

 comprising two species of very handsome greenhouse ever- 

 green shrubs. Flowers in terminal pedunculate racemes ; 

 corolla tubular at the base, campanulate ; upper segment 

 of limb equal in length to the lip, and, like it, incum- 

 bent in aestivation. The species thrive in a compost of 

 sandy loam and leaf mould. Half -ripened shoots will root, 

 during spring, in sand, under a bell glass. 



ii 3 (Cl 



iCanaryX ft. golden-yellow, dense ; segments of 

 the corolla acute. June. 1. permanent, lanceolate, serrated. 

 A. 4ft. to 6ft Canary Islands, 1698. SYN. Digitalis canariensis. 

 (B. B. 48.) 



I. sceptrum (sceptre), ft. yellowish-brown, dense ; segments of 

 corolla obtuse. July. 1. obovate - lanceolate, denticulated. 

 A. 3ft to 4ft Madeira, 1777. SYN. Digitalis sceptrum. 

 (S. E. B. 73.) 



ISOPOGON (from isos, equal, and pogon, a beard ; 

 referring to the beard-like fringes on all parts of the in- 

 florescence). OBD. ProteacecB. A genus comprising 

 about twenty - nine species of greenhouse evergreen 

 shrubs, limited to extra-tropical Australia, and having 

 the habit of Petrophila. Flowers yellow, pink, or lilac, 

 in dense spikes or cones, each flower sessile, within a 

 bract or scale ; the cones hemispherical, globular, or ovoid, 

 terminal, or rarely axillary. Leaves rigid, entire or 

 divided, terete or flat, and sometimes broad. For culture, 

 see Protea. The following is a selection of the species 

 introduced : 



I. anemonlf olios (Anemone leaved), ft., perianth yellow, 

 glabrous, except the terminal tufts of short hairs ; cones sessile, 

 solitary, or in clusters of two or three at the ends of the branches, 

 nearly globular. July. I. on rather long petioles, once or twice 

 trifle! or pinnately divided, with linear or linear-acute, entire, bi- 

 or trilobed segments, h. 4ft. to 6ft. 1791. (L. B. C. 1337 ; B. M. 

 697, under name of Protea anemonifolia.) 



L attenuates (attenuated), ft., perianth pale yellow; laminae 

 villous outside ; the tube glabrous, or nearly so ; cones terminal 

 or in the upper axils, sessile, depressed, globular. April. 

 L oblong-spathulate to almost linear, with a small straight or 

 hooked point, much narrowed into the petioles, thick, and almost 

 veinless. h. 2ft to 3ft (B. M. 4372.) 



I. Baxter! (Baxter's), ft., perianth pink, very villous ; cones de- 

 pressed, globular, terminal, often clustered amongst numerous 

 floral leaves. ApriL L from broadly cuneate, undulate, and 

 toothed only at the end, to twice or thrice three-lobed. h. 2ft. 

 1831. (B. M.3539.) 



I. cnneatus (cuneate). ft., perianth pale purple, glabrous, or 

 with small tufts at the lips of the laminae ; cones terminal, de- 

 pressed, globular. June. I. from obovate-oblqng to lanceolate 

 or oblanceolate, obtuse, with a small callous point, rather thick, 

 obscurely veined. A. 7ft to 8ft 1830. (B. M. 3421, under name 

 of /. Loudoni.) 



I. longifolius (long-leaved), ft., perianth yellow, silky-villous ; 

 cones terminal, sessile, ovoid or at length globular. April. 

 I. long, linear or oblanceolate, obtuse with a small callous or 

 acute point, narrowed into a long petiole. A. 2ft. to 8ft. 1823. 

 (B. U. 900.) 



Isopogon continued. 



I. rosens (rose), ft., perianth pink, glabrous, tipped with small 

 tufts of hairs ; cones terminal, globular, solitary or clustered. 

 April I. once or twice ternately divided or shortly pinnate ; the 

 segments linear or cuneate, entire or three-lobed, rigid, flat, con- 

 cave or channelled, acute, but scarcely pungent A. 1ft to 4ft. 

 1840. (B. M. 4037, under name of /. scaber.) 



I. sphserocephalus (globe-headed), ft., perianth tube glabrous ; 

 the laminae densely hirsute, with yellow hairs ; cones solitary and 

 terminal, or two or three crowded at the ends of the branches, 

 globular. March. I. linear or almost lanceolate, obtuse, with a 

 short callous point, slightly contracted towards the base, but 

 sessile; margins often recurved, and the midrib prominent be- 

 neath. A. 4ft. (B. M. 4332.) 



ISOPYRUM (from tso, equal, and Pyros, Wheat; 

 a Greek name applied to another plant). Including 

 Enemion and Leptopyrum. OBD. Ranunculacece. This 

 genus contains about seven species of dwarf, slender 

 perennial herbs, natives of the temperate regions of the 

 Northern hemisphere. Flowers white, solitary or loosely 

 paniculate. Leaves ternate, decompound ; leaflets stalked, 

 three-lobed, or cut, membranous. The only species in 

 cultivation is I. thalictroides, which is a very graceful 

 little subject, with foliage resembling a Maidenhair 

 Fern. It looks extremely pretty when grown on rock- 

 work or a border, and thrives in almost any moderately 

 good garden soil. Propagated by seeds ; or by division of 

 the roots, in autumn. 



FIG. 338. ISOPYRUM THAIICTROIDES, showing Habit and 

 detached Leaflet. 



I. thalictroides (Thalictrum-like).* ft. white, small; sepals 

 blunt. Spring. I., leafstalks dilated at the base into mem- 

 branous auricles. Root creeping, fascicled, or grumose. A. 9in. 

 to!5in. Europe, 1759. See Fig. 338. 



ISOTOMA (from t'sos, equal, and toma, a section; 

 segments of corolla equal). OBD. Campanulacece. A 

 genus comprising eight species of stove or greenhouse 

 herbaceous perennials, formerly included under Lobelia. 

 Flowers in axillary or terminal racemes. Leaves alter- 

 nate, entire, largely dentate or pinnatifid. For culture, 

 see Lobelia. 

 I. axillaris (axillary-flowered), ft. blue ; corolla flat, with long 



green tubes ; peduncles axillary, elongated, and one-flowered. 



Autumn. 1. sessile, pinnatifid, toothed. A. 1ft Australia, 1824. 



Greenhouse perennial. (B. M. 2702, under name of Lobelia 



senecioides.) 

 I. a. subpinnattflda (sub-pinnatifld)has the laciniae of the leaves 



longer than in the type, and not unfrequently again pinnatifid. 



SYN. /. senecioides subpinnatifida (under which name it is 



figured in B. M. 5073). 

 T Brownii (Brown's), ft. purple, racemose. Autumn. L linear, 



quite entire. Stems almost simple. A. 1ft. West Australia, 1829. 



Greenhouse annual. (B. M. 3075, under name of Lobelia hypo- 

 crate riformis.) 



