HIPPOPHAE 



HOFFMANNIA 



1495 



young growth covered with silvery scales or stellate 

 hairs: Ivs. alternate, narrow: fls. dioecious, from the 

 axils of last year's branches in short racemes, the axis 

 of which mostly develops into a branchlet or thorn in 

 the pistillate plant, but is mostly deciduous in the 

 staminate one; staminate fls. sessile, with 2 valvate 

 sepals and usually 4 stamens with short 

 filaments; pistillate fls. short-stalked; 

 the 1-ovuled ovary inclosed by a recep- 

 tacle bearing 2 minute sepals at its 

 apex, style filiform with a cylindric 

 stigma: fr. drupe-like, with a bony 

 ovate stone. Two species in Eu. and 

 W. and C. Asia. 



The sea buckthorns are suckering 

 shrubs or small trees with spreading 

 usually spiny branches clothed with 

 silvery gray narrow and rather small 

 foliage, with insignificant yellow flowers 

 appearing in spring before the leaves 

 and followed in the pistillate plant by 

 small but numerous bright orange-yel- 

 low berries persisting through the win- 

 ter. The common sea buckthorn is 

 perfectly hardy North, while the Himal- 

 ayan species is tenderer and but rarely 

 planted. The former inhabits the sandy 

 banks of rivers and the seashore and 

 also the steppes of central Asia. It 

 grows well in almost any kind of soil 

 including limestone and saline soil; in 

 poor sandy soil it remains shrubby and 

 spreads freely by suckers and has there- 

 fore been used successfully for the 

 fixation of shifting-sand dunes; in better 

 soil it grows into a small tree. It also 

 is used sometimes for hedges in Europe. 

 The pistillate plant is strikingly hand- 

 some in autumn when covered with 

 its orange berries, which often are so 

 numerous as to weigh down the 

 branches. To insure a good setting of 

 berries it is necessary to plant one or 

 a few staminate plants with each group 

 of pistillate ones; the staminate and 

 pistillate plants may be distinguished 

 even without flowers or fruits fairly 

 well by their habit, the former being of 

 more upright growth, while the pistil- 

 late ones are more spreading and twiggy. 

 The berries are somewhat poisonous 

 and but rarely eaten by birds. Propa- 

 gation is by seeds sown at once or 

 stratified, by cuttings of mature wood 

 in spring, and also by root-cuttings, suckers and layers, 

 rhamnoides, Linn. Shrub or tree, occasionally to 30 

 ft.: branches gray, usually spiny: winter-buds golden 

 brown: Ivs. linear-lanceolate, short-petioled, obtusish, 

 covered on both sides with silvery scales, at maturity 

 above often glabrescent, %-2}/2 in. long: fls. appearing 

 before the Ivs., very small, yellowish: fr. subglobose or 

 ovoid, orange-yellow, Y^-y^m. long, ripening in Sept. 

 Eu. through W. and Cent. Asia to the Altai, W. China 

 and N. W. Himalayas. B.M. 8016. Gn. 49:62. G.M. 

 37:791. Gn.W. 21:110. J.H. III. 51:161. G.W. 15, p. 

 345. Var. angustifdlia, Loud., a form with pendulous 

 branches and narrow Ivs. Var. procera, Rehd. Tree, 

 to 50 ft.: young growth villous: Ivs. oblong-lanceolate 

 to lanceolate, with stellate hairs above, finally glabrous 

 above. W. China. 



H. salicifblia, D. Don. Tree, to 40 ft.: Ivs. lanceolate, acute, 

 green aboye, white villous-tqmentose beneath, 1 J^-4 in. long: fr. 

 lg e, Kin. long. Temp. Himalayas. ALPRED R EHDE R. 



HIPPURIS (horse-tail from the looks of the plant). 

 Halorngidacese. Perennial aquatic herbs, one some- 

 times used in bog-gardening. Sts. simple: Ivs. small, 



1842. Hippuris 

 vulgaris. (XYz) 



simple and entire, verticillate : fls. small and incon- 

 spicuous, perfect or polygamous, sessile in the axils; 

 petals none; calyx entire; stamen 1; nearly or quite ses- 

 sile, with the thread-shaped style lying between the 

 2 anther-lobes: fr. nut-like, 1 -seeded. Three species, 

 very widely dispersed in temperate and frigid regions. 

 H. vulgaris, Linn. (Fig. 1842), may be transferred to 

 wet grounds and pools: to 2 ft. (or more in deep water) : 

 Ivs. 6-12 in a whorl, acute, usually withered at the 

 apex. In ponds and streams, Greenland, and Alaska 

 to N. Y., New Mex., Calif.; also in Eu., Asia and in 

 Patagonia. It produces an attractive effect with the 

 simple shoots standing above the water in ponds. 



L. H. B. 



HOBBLEBUSH: Viburnum lantanoides. 



HODGSONIA (B. H. Hodgson, British scientist). 

 Cucurbitacese. One species, a showy tendril-climbing 

 shrub, in its native places in India sometimes extend- 

 ing 100 ft.; H. macrocdrpa, Cogn. (H. heteroclita, Hook, 

 f. & Thorn.), hardly to be expected in cult. Lvs. cori- 

 aceous, 6-8 in. long, deeply 3-5-lobed, the lobes entire 

 or slightly dentate: fls. dioecious, white, tinged yellow 

 within, the limb of the deeply 5-parted corolla bearing 

 curling fringes 4 in. long; male fls. in long racemes, 

 females solitary; calyx very long-tubular and slender; 

 stamens 3, exserted; stigmas 3 and 2-fid, exserted: fr. 

 berry-like, spherical, 4-10 in. across, red-brown and 

 tomentose; seeds 2-3 in. long. F.S. 12:1262. This 

 odd and showy plant is said to require the conditions 

 provided by a temperate greenhouse, although some 

 report it as requiring hothouse treatment. L. jj_ 3. 



HOFFMANNIA (Georg Franz Hoffmann, 1760 or 

 1761-1826, professor of botany at Goettingen). Includ- 

 ing Campyldbotrys and Higginsia. Rubiacese. Tropical 

 American herbs or shrubs, with opposite or verticillate 

 leaves and small white, yellow or red flowers, cultivated 

 for the very showy foliage. 



Branches either terete or 4-angled: Ivs. simple: 

 corolla tubular, with 4 (rarely 5) oblong or linear-obtuse 

 lobes; stamens mostly 4; disk ring-like about the 2-3- 

 loculed ovary or cushion-like; style filiform, the stigma 

 2-lobed: fr. an oblong or narrow many-seeded berry. 

 Species above 30, Cent, and S. Amer. The hoffmannias 

 require warm temperature, although they may be 

 plunged in the open in the summer. Well-grown speci- 

 mens are also adapted to the decoration of window- 

 gardens and living-rooms. Prop, by cuttings. Hoff- 

 mannias are very showy foliage plants. 



1843. Hoffmannia 

 discolor. A loose- 

 growing sprig. ( X M) 



