HEVEA 



HIBISCUS 



1483 



whorls. British Guiana. H.I. 2574, 2575. Some- 

 times used for rubber. 



guianensis, Aubl. (Siphbnia Cahuchu, Willd. S. 

 eldstica, Pers.). SERINGA. Tree, to 60 ft. high: Ifts. 

 obovate, base acute, apex obtuse, 3-5 in. long: panicle 

 tomentose: staminate buds obtuse; stamens 5 in 1 

 whorl. French Guiana to the Amazon. H.I. 2573. 

 Intro, but rarely cult, for rubber, j; g. g t NORTON. 



HEXACENTRIS: Thunbergia. 



HEXADESMIA (name alludes to the 6 pollen- 

 masses). Orchidaceas. About a half-dozen Trop. Ameri- 

 can epiphytic orchids, rarely grown in hothouses. They 

 are like Scaphyglottis, but differ in having 6 pollinia 

 in 2 series rather than 4. The fls. are small, in fascicles 

 or racemes: Ivs. fleshy. Apparently none of the spe- 

 cies is in the trade. 



HEXASTYLIS: Asarum. 



HEXISEA (Greek, six equal things; because the 

 attractive and bright-colored parts of the fls. are 6, 

 and of equal size.) Should have been written Hexisia. 

 Orchiddcese. This includes a small epiphytic plant 

 which was once advertised as "bearing profuse panicles 

 of bright vermilion fls. twice a year." The genus belongs 

 to a subtribe closely related to Epidendrum but with 

 different pollinia. Sts. terete or angled, with usually 

 2 Ivs. at the apex of each annual growth. New growths 

 arise in the axils of the Ivs., the entire st. being thus 

 made up of long, fusiform, apparently superimposed 

 pseudobulbs, with 2 Ivs. at each node: Ivs. few, narrow: 

 racemes terminal, the short-peduncled furnished with 

 overlapping, leathery scales; fls. orange or purple; 

 anthers semi-globose; pollinia 4, in 1 series. Four 

 species, ranging from Mex. to Guiana. 



bidentata, Lindl. Height 6"-8 in.: st. branched, 

 forming spindle-shaped, many-grooved internodes: Ivs. 

 in pairs, 2-4 in. long, 3 lines wide, channelled, notched. 

 Panama. B.M. 7031. G.M. 37:19. 



HEINRICH HASSELBRING. 



HEYDERIA: Libocedrus. 



HIBBERTIA (George Hibbert, English patron of 

 botany, died 1838). Dillenidcess. Shrubs or subshrubs 

 with yellow or white showy flowers, suitable for the 

 greenhouse or for growing in the open in the warm 

 parts; apparently none is in the American trade. 



Erect, procumbent or climbing, sometimes almost 

 herbaceous, some species reaching 5 or 6 ft. : Ivs. mostly 

 small, entire or dentate, often heath-like, strongly 

 1-nerved with obscure or rarely prominent reticulations, 

 some of them usually crowded beneath the blossoms: 

 fls. solitary, terminal, sometimes approximating into 

 clusters; sepals 5, sometimes united at base; petals 5, 

 spreading and usually making an open fl.; stamens 

 usually 12 or more, sometimes with staminodia: carpels 

 usually 2-5, dehiscent at the top when ripe. Species 

 about 100, nearly all Australian, a few from Madagas- 

 car. Any of these species is likely to appear in lists, 

 but only 2 or 3 are regularly known as horticultural 

 subjects. 



dentata, R. Br. Woody only at base, trailing or 

 twining, with rather large dark yellow pedunculate 

 fls. (to 2 in. diam.): Ivs. stalked, oblong, to 2 in., dis- 

 tantly toothed or sinuate, coppery: petals obovate, 

 entire or nearly so; stamens slender and very numerous; 

 staminodia present/ New S. Wales and Victoria. B.M. 

 2338. B.R. 282. G. 32:127. L.B.C. 4:347. 



perfoliata, Hueg. Sts. trailing, procumbent, ascend- 

 ing or becoming erect: Ivs. ovate, usually somewhat 

 toothed, perfoliate: petals obovate, entire, pale yellow, 

 the fls. peduncled; stamens numerous, with a few 

 Btaminodia. W. Austral. B.R. 29:64. J.H. III. 43:147. 



volftbilis, Andr. Sts. woody, trailing, or climbing 

 2-4 ft.: Ivs. obovate to lanceolate, to 3 in., clasping: 

 fls. large, yellow, somewhat fetid, sessile or nearly so; 

 petals obovate, entire; stamens very numerous, no 

 staminodia. Queensland and New S. Wales. B.M. 

 449. This and H. dentata are offered in England. 



L. H. B. 



HEBISCADELPHUS (brother of Hibiscus). Malvaceae. 

 Under this name, J. F. Rock founds three species of 

 Hawaiian small trees; of two of the species only one 

 individual tree is in existence, while of the third several 

 may still be found on the slopes of Mt. Hualalai, in the 

 forest of Waihau, in North Kona, Hawaii. From 

 Hibiscus the genus differs in the deciduous calyx and 

 other floral characters: fls. 2 H in- or less long, yellow- 

 ish, magenta, or green: lys. cordate, unevenly 3-5- 

 pointed or rounded and entire. H. Giffardianus, Rock, 

 is a medium-sized tree with peculiarly shaped deep 

 magenta fls. and cordate-orbicular Ivs.; a single tree 

 known in 1913 and in danger of extinction. H. Wilderi- 

 anus, Rock, is a tree 15-18 ft. high with yellowish fls. 

 and 3-lpbed wavy Ivs. of orbicular outline; one tree 

 known in 1912 and in a dying condition, one on which 

 the collector was able to find 1 open fl. and a few more 

 or less developed buds. H. hualalaiensis, Rock, has 

 green fls. somewhat reddish inside, and somewhat 

 reniform Ivs.; a few trees are still in existence. These 

 rare trees are not in the trade, but they are likely to 

 appear in collections in the tropics if they can be 

 rescued before destruction. See Rock, "Indigenous 

 Trees of the Hawaiian Islands." L t jj, g. 



HIBISCUS (old Latin name). Including Abel- 

 moschus and Paritium. Malvaceae. ROSE-MALLOW. 

 Showy-flowered garden and greenhouse herbs and 

 shrubs; in the tropics some of them are trees. 



Hibiscus is a polymorphous genus, allied to Gossy- 

 pium, Abutilon, Althaea and Malva, the species widely 

 distributed in temperate and tropical countries: herbs 

 or shrubs, or even trees, with Ivs. palmately veined or 

 parted: parts of the fl. in 5's; calyx gamosepalous, 

 5-toothed or 5-cleft, subtended by an involucel of 

 narrow bracteoles; corolla usually campanulate, showy, 

 of 5 distinct petals; stamens united into a 5-toothed 

 column; ovary 5-loculed, bearing 5 styles: fr. a dry, 

 more or less dehiscent caps (Fig. 1828). Between 150 

 and 200 species, of which perhaps 

 20 occur in the U. S. Horticultur- 

 ally, there are 4 general groups of 

 Hibiscus the annuals, the peren- 

 nial border herbs, the hardy 

 shrubs, and the glasshouse shrubs, 

 to which might be added the tree- 

 like species of tropical countries 

 that are often planted along road- 

 sides and about dwellings. The 

 perennial herbaceous species are 

 among the boldest subjects for 

 planting in remote borders or in 

 roomy places, particularly in soil 

 that is damp. These plants, of the 

 H . Moscheutos type, are commonly 

 known as marsh-mallows, but this 

 name properly belongs to Althaea officinalis. 



In recent years, improved and valuable hardy forms 

 of the native herbaceous rose-mallows have been intro- 

 duced. They bloom throughout a long season. (Fig. 

 1829.) The Meehan Mallow Marvels were introduced 

 in 1905, the first successful cross having been made in 

 1898. They are stated to be hybrids of H. coccineus, 

 H. militaris, and H. Moscheutos. They are in pink, 

 shades of red, and white; the flowers often have an eye 

 of different color. The Giant-flowering marsh-mallows 

 of Bobbink & Atkins, now catalogued as H. Moscheu- 

 tos hybrids, were first offered in 1909 at retail and in 



1828. Capsule of 

 Hibiscus syriacus. 



