140 



THE DICTIONARY OF GARDENING, 



Heterotoma continued. 



H. lobelioides (Lobelia-like).* Bird Plant. fl. purplish and yellow, 

 racemose ; corolla very curious, somewhat tubular, with a taper- 

 ing base. I. broadly ovate, with distant teeth. Stem becoming 

 woody at the base. Mexico, 1861. (F. d. S. 1454.) 



HETEROTRICHUM. A synonym of Saussurea 

 (which see). 



HETEROTROPA (from heteros, various, and trope, 

 a change; in allusion to the variable nature of the 

 plants). ORD. Aristolochiacece. A small genus of green- 

 house or half-hardy perennial herbs, with creeping roots, 

 natives of Japan ; now included, by Bentham and Hooker, 

 under Asarum. Flowers terminal, solitary, shortly pe- 

 dunculate ; perianth dusky-purple or lurid ; lobes acute or 

 caudate-acuminate. Leaves long, petiolate, cordate-reni- 

 form or almost hastate. For culture, &c., see Asarum. 



H. asaroides (Asarum-like). fl. inclined or drooping, on very 

 short peduncles ; perianth dull purplish-green, depresso-globose, 

 contracted at base and mouth ; limb of three triangular blunt 

 segments, spreading horizontally; internal surface deeply 

 cellular. April and May. I. petiolate, deeply cordate, nearly 

 ovate, entire, spotted; petioles erect, as long as the leaves. 

 Rhizome branched and nodose. A. 6in. 1836. Plant glabrous. 

 Greenhouse. SYN. Asarum japonicum. (B. M. 4933.) 



H. parviflora (small-flowered), fl. purple and green, solitary, 

 bracteated, about half the size of those of H. asaroides ; perianth 

 urceolate ; tube constricted above the middle, oval-ventricose 

 below ; segments of limb broadly ovate ; bracts longer than the 

 flowers. April. I. solitary, cordate, white-spotted, with a deep, 

 narrow sinus. A. Sin. 1862. Greenhouse. (B. M. 5380.) 



HEUCHERA (named after Johann Heinrich Heucher, 

 1677-1747, Professor of Medicine at Wittenburg). Alum 

 Root. OBD. Saxifragece. This genus comprises about 

 twenty species of elegant hardy perennial herbs, natives 

 of temperate North America, from Mexico almost to the 

 Arctic regions. Flowers rather small, spicate, racemose 

 or paniculate, bracteate, glabrous or pubescent. Leaves 

 radical, long-petiolate, broadly cordate or orbiculate, 

 lobed or crenate. All the species are of easy culture 

 in any ordinary garden soil, except stiff clay, and may 

 be readily increased by dividing the crowns during spring. 

 Most of the Heucheras have inconspicuous flowers, but 

 H. sanguinea is one of the handsomest of recently-in- 

 troduced herbaceous plants. All are worth growing on 

 account of their foliage, but a couple of species will be 

 sufficiently representative of the general character of 

 the genus. 



H. americana (American).* fl. reddish; tbyrse elongated, 

 panicled. Summer. I. on long petioles, somewhat five to seven- 

 fobed, toothed. A. lift. North America, 1656. Plant clothed 

 with clammy pubescence. 



H. caulescens (caulescent) A synonym of H. villosa. 



H. cylindrica (cylindrical). A. greenish, rather large ; panicle 

 compact, cylindrical. Summer. I. cordate, deeply and roundly 

 lobed, crenated, ciliated, truncate at the base. A. 1ft. to lift. 

 Oregon, Ac., 1830. (B. R. 1924.) 



FIG. 223. HEUCHERA GLABRA. 



H. glabra (glabrous), ft. white, small ; panicle loose. Summer. 

 I. cordate, acutely lobed, glabrous, unequally and acutely toothed; 

 lower stem ones or bracts toothed, h. 1ft North-west America, 

 1827. See Fig. 223. (H. F. B. A. L 79.) 



Heuchera continued. 



H. hlspida (hispid).* fl. veined with purple, more or less oblique ; 

 stamens soon exserted, longer than the spathulate petals ; 



r nicies very narrow ; scapes 2ft. to 4ft. high. May to July, 

 rounded, slightly five to nine - lobed. High mountains of 

 Virginia and Carolina, 1826. Plant hispid or hirsute, with long 

 spreading hairs (occasionally almost glabrous), scarcely glan- 

 dular. SYN. H. Richardsonii. 



H. Menzlesii (Menzies'). A synonym of Tolmiea Menziesii. 



XL micrantha (small-flowered), fi. yellowish ; panicle loose. 

 Summer. 1. roundish - cordate, nearly naked, bluntly lobed, 

 crenate; teeth horned. A. 2ft. North-west America, 1827. 

 (B. R. 1302.) 



H. pubescens (downy), fl. pale red, variegated with yellow, 

 large ; branches of panicle short, crowded with flowers. Summer. 

 I. somewhat acutely lobed, toothed ; teeth mucronate. A. 1ft. 

 United States, 1812. Plant covered with powdery down. SYNS. 

 H. pulverulenta, H. ribifolia. 



H. pulverulenta (powdery). A synonym of H. pubescens. 



H. ribifolia (Currant-leaved). A synonym of H. pubescens. 



H. Richardsonii (Richardson's). A synonym of H. hispida. 



H. sanguinea (blood-coloured).* fl. deep red, paniculate, some- 

 what campanulate. Summer. I. cordate, orbiculate, five to 

 seven-lobed ; lobes dentate, ciliate ; petioles clothed with spread- 

 ing hairs. A. 9in. to 18in. Northern Mexico, 1882. (Gn. xxvi. 

 360.) 



H. villosa (villous). JL violet, small, loosely panicled ; petals 

 spathulate-linear, about as long as the stamens, soon twisted ; 

 scapes 1ft. to 3ft. high, villous, with rusty hairs (as are also the 

 petioles and veins of the leaves beneath). August and September. 

 7. acutely seven to nine-lobed. United States and Canada, 1812. 

 SYN. H. caulescens. 



(from Hevd, a vernacular name in Northern 

 South America). SYNS. Micrandra, Sipnonia. OBD. Eu- 

 phorbiaceos. A genus comprising nine species of tall 

 stove trees, natives of the damp forests of tropical 

 America. Flowers in dichotomous cymes. Leaves alter- 

 nate, on long petioles, digitately five-foliolate ; leaflets 

 petiolulate, entire. Of the two or three species yet in- 

 troduced, the best-known is the one here described. It 

 succeeds in a sandy loam. Propagated by cuttings, 

 made of half-ripened wood, and inserted in sand, under 

 a hand glass, in heat. 

 H. braziliensis (Brazilian). /. green, white. May. I. light green, 



digitately trifoliolate. A. 60ft. Tropical South America, 1823. 



This plant furnishes the well-known Para rubber of commerce. 



HEWARDIA. Now included under Adiantum. 



HEXACENTRIS. This genus is now included, by 

 the authors of the " Genera Plantarum," under Thun- 

 bergia (which see). 



HEXAGLOTTIS (from hex, six, and glotta, a tongue ; 

 in reference to the six spreading lobes of the style). 

 OBD. IridecB. A genus of two or three species of pretty 

 greenhouse bulbous plants, from South Africa, rarely seen 

 in cultivation. For culture, see Ixia. 

 H. longifolia (long-leaved). fl. yellow ; segments nearly equal, 



oblong, spreading ; filaments united in a cylinder. May. A. lift. 



1766. SYNS. Homeria and Morcea flexuosa. (B. M. 695, under 



name of Morcea flexuosa.) 

 H. vlrgata (twiggy), fl. yellow. May. A. 2ft. 1825. 



HEXAGONAL. Six-sided. 



tTIA (named after George Hibbert, a distin- 

 guished patron of botany, who died in 1838). Including 

 Cyclandra, Hemistemma, and Pleurandra. OBD. Dil- 

 leniacecB. A genus of about seventy species of stove 

 or greenhouse shrubs or under-shrubs, of which two are 

 from Madagascar, three or four from New Caledonia, and 

 the rest from Australia. Flowers yellow or white, solitary 

 and terminal, or apparently axillary, sessile, in a tuft of 

 floral leaves, or pedunculate. Leaves entire, or rarely 

 largely or remotely dentate, often Heath-like, one-nerved 

 or obscurely reticulate, penniveined. Hibbertias grow 

 freely in peat or loam, either together or separate ; 

 a sufficient quantity of sand must, however, at all times 

 be added, to maintain the soil in a healthy, porous con- 

 dition. The pruning of weak and straggling shoots will 

 need attention. If insects appear, they must be eradi- 

 cated at once, or they will soon cause the plants to 

 become both unhealthy and unsightly. Propagation may 



