194 



HENDERSON'S HANDBOOK OF PLANTS 



HOR 



the Horseradish nearer, so that when grown 

 between Beets it should be planted at the dis- 

 tance of two feet between the plants in the 

 rows, making about the same number of plants 

 per acre as when planted between Early 

 Cabbages. 



This manner of growing Horseradish we 

 claim to be a great advance on the methods 

 generally practised. All American writers on 

 the subject, that we have seen, follow in the 

 same track, and recommend planting the 

 crowns. This not only destroys the most sale- 

 able part of the root, but when planted thus, 

 the crowns produce only a sprawling lot of 

 rootlets which are utterly unsaleable in the 

 market. 



Horseradish Tree. See Moringa. 



Horse-tail. The genus Equisetum. 



Horteusis. Of or belonging to a garden ; the 

 word is often contracted thus : hort. 



Hotei'a Japonica. A synonym of Spircea 

 or Astilbe Japonica. 



Hottentot Bread. A South African name for 

 Testudinaria Elephantipes. 



Hottentot Fig. Mesembryanthemum edule. 



Hotto'nia. Water Violet. Named after P. 

 Hotton, a Dutch botanist. Nat. Ord. Primu- 

 kicecB. 



Hardy aquatic or marsh plants. H. injlata 

 is common in pools and ditches from New 

 England southward. H. palustris, the Water 

 Violet, is a singular and beautiful plant, com- 

 mon in pools in many parts of England. The 

 leaves grow wholly under water ; from them 

 there arises a long Hower stalk bearing a 

 pyramid of blue or white flowers, which are 

 disposed in whorls. It is a very interesting 

 plant for the aquarium. 



HouUe'tia. Named after M. Houllet, a French 

 gardener. Nat. Ord. Orchidace<B. 



A small genus of very handsome epiphytal 

 Orchids, natives of Brazil. The genus is re- 

 lated to Stanhopea, and requires the same 

 treatment. 



Hound's Tongue. See Cynoglossum. 



Houseleek. See Sempervivum. 



Housto'nia. Named in honor of Dr. W.Houston, 

 an English botanist. Nat. Ord. Rubiacem. 



This elegant genus of small flowering plants 

 is found throughout the Northern and 

 Western States. They are well adapted for 

 flower borders, rock-work, or shaded beds, 

 and thrive best in a moist situation. The 

 colors of the flowers are white, blue and pur- 

 ple. Herbaceous perennials, popularly known 

 as Bluets, and propagated by division of 

 the roots. 



Ho'vea. Named after A. P. Hove, a Polish 

 botanist. Nat. Ord. LeguminoscB. 



A genus of handsome, blue-flowered ever- 

 green shrubs from New Holland. " H. Celsii 

 (Syn. H. elliptica), one of the best known, is a 

 beautiful green-house plant, flowering like 

 most of the species, in the spring. This plant 

 exhibits the peculiarity of the flower buds of 

 the preceding year appearing at the base of 

 those expanded duringthe present ; acommon 

 condition of leaf buds, which are always visi- 

 ble the season preceding their expansion, but 

 not frequently so with flower buds, which, 

 though they may be formed several years 



HUG 



before their development externally, gener- 

 ally remain concealed till the period of their 

 unfolding." The flowers are pea-shaped, ax- 

 illary, on short peduncles. Propagated by 

 seeds ; introduced in 1818. 



Hove'nia. In honor of David Hoven, a Senator 

 of Amsterdam, who contributed to the success 

 of the travels of Thunberg. Nat. Ord. 

 Rhamnacece. 



These are small fruit-bearing trees, growing 

 to the height of eight or ten feet, and pro- 

 ducing a fruit which is said to taste like the 

 Bergamot pear. H. dulcis, a native of Japan, 

 has been introduced into this country, and 

 grown as an ornamental fruit-bearing tree. 

 None of the other species are hardy. 



Ho'wea. From Lord Howe's Island where 

 only the genus is found. Nat. Ord. Palmacece. 

 This name is now generally adopted for the 

 two palms introduced and cultivated under 

 the names of Kentia Belmoreana, and K. 

 Fosteriana. 



Ho'ya. Wax Flower. In lionor of Thomas Hoy, 

 F. L. S., gardener to the Duke of Northumber- 

 land at Sion House, England. Nat. Ord. 

 Asclep iadacece. 



The most common species, H. Carnosa, has 

 curious, wax-like flowers, from which drops 

 a sweet, honey-like juice. It is a hot-house 

 climber, which requires a light rich soil, and 

 is propagated by cuttings, which require an 

 average temperature of not less than 75^ to 

 root freely. It is sometimes grown in green- 

 houses, in a warm situation, exposed to the 

 sun. It makes an excellent plant for a warm 

 sitting-room, as it grows freely without direct 

 light. Introduced from Asia in 1802. The 

 variegated-leaved variety is a very orna- 

 mental plant ; H. bella, with beautiful waxy 

 white flowers and dwarf shrubby slender 

 habit, forms an excellent subject for a hang- 

 ing basket in a warm green-house. There are 

 many other species of much beauty, all requir- 

 ing a warm plant-stove to bring them to per- 

 fection. 



Huckleberry. "Whortleberry. The popular 

 names of the genus Gaylussacia, of which 

 there are several species. G. dumosa, the 

 Dwarf Huckleberry, G. frondosa, the Blue 

 Huckleberry, and G. resinosa, the Black 

 Huckleberry, are common throughout the 

 United States, the latter being the Huckle- 

 berry of the Northern States. 



Hudso'nia. False Heath. Named after William 

 Hudson, author of "Flora Anglica." Nat. 

 Ord. Clstacece. 



A genus of bushy little heath-like shrubs, 

 seldom a foot high, covered all over with 

 small awl-shaped or scale-like persistent 

 downy leaves, and bearing numerous small, 

 but showy yellow flowers in May, crowded 

 along the upper part of the branches. Found 

 in dry sandy soil near the coast, from Main ^ 

 to V irginia. From its resemblance when not 

 in bloom to Heather (Calluna vulgaris), it is 

 often taken for that plant. 



Huge'lia. Named after Baron Hugel, of Vienna, 

 Nat. Ord. PolemoniacecB. 



A small genus of hardy annuals from Cali- 

 fornia with blue and yellow flowers, 

 propagated by seeds. First discovered in 

 1833. This genus is now included under 

 Gilia. 



