104 



HENDERSON'S HANDBOOK OF PLANTS. 



HOL 



J 



Holcus. From helko, to extract; the original 

 plant was supposed to possess the power of ex- 

 tracting thorns. Linn. Polygamia-Mona>cia. 

 Nat.Ord. Graminacece. 



A genus of grasses that have soft, woolly herb- 

 age, mostly natives of Great Britain. They are 

 of but little value. H. lanatus is common in 

 our moist meadows, having become naturalized 

 from Europe. It is popularly known as Velvet 

 Grass. 



Holv Ghost Plant. See Peristeria (Ma . 



Holly. See Ilex. 



Hollyhock. See Atthtra. 



Holy Grass. A common name applied to Hier- 

 ochloa, a genus of sweet-scented grasses, that are 

 strewn before the church doors on saints' days, 

 in the North of Europe. 



Holy Rose. See Anctstntira. 



Holy Thistle. See Carduus. 



Homalonema. From htmalos, regular, and nema, 

 a filament. Linn. Moncecia-Polyandria. Nat. Ord. 

 Aracetn. 



A small genus of herbaceous plants, with 

 heart or arrow-shaped leaves, and flowers re- 

 sembling the Richardia. They are natives of 

 China. //. cordata is occasionally grown in 

 green-houses, and requires the same treatment 

 as the Richardia. H. aromatica has an agreeable 

 aromatic odor, and its root is supposed by the j 

 natives to possess medicinal properties. 



Homeria. Named after Homer, the distinguished 

 father of epic poetry. Linn. Monaddphia-Mono- 

 gynia. Nat. Ord. IridacecK. 



A small genus of pretty flowering bulbs from 

 the Cape of Good Hope, and formerly included 

 in the genus Morea. They succeed well in the 

 open border, but require the protection of a 

 frame during winter. Propagated by offsets, 

 that should be taken off in September. 



Honesty. See Lunaria. 



Honey Flower. See 'Melianthus. 



Honey Garlic. See Nedaroscardum. 



Honey Locust and Honey Bean. See GledU- 

 ttctiin. 



Honeysuckle. See Lonicera. 



Honey Wort. See C.jrinihe. 



Hoop Petticoat. See Corbularia and Narcissus 

 bufbocodium. 



Hop. See Humulus. 



Hop Hornbeam. See Ostryn. 



Hordeum. Barley. According to Bodaeus, the 

 name is derived from hordns, heavy; because 

 the bread made from Barley is very heavy. 

 Linn. Triandria-Digynia. Nat. Ord. Oramina- 

 cecn. 



This genus is one of the most valuable of all 

 the natural order to which it belongs. The most 

 useful of the species is H. vuigare, the common 

 Barley, which see. H. jubatum, Squirrel-tail 

 Grass, is a native species, and is common on the 

 shores of the great lakes. It is a species without 

 any special interest. 



Horehound. See Marrubium. 



Horkelia. Named after J. Horkd, a German bot- 

 anist. Linn. Decandria-Monogynia. Nat. Ord 



Hardy herbaceous perennials, found in Cali- 

 fornia m 1826. They are desirable plants for 

 the garden, bearing white flowers, and having 

 foliage finely cut like Potentilla, to which it is 

 allied. Propagated by seeds or division. 



Horn Poppy. See Glaucium. 



Horse Balm. See (.kUinsonia. 



Horse Chestnut. See ^Esculus. 



Horse Mint. See Monarda. 



HOY 



Horse Nettle. A local name of Solanum Caroli- 

 en.s-e. 



Horseradish Tree. See Mor'mga. 



Horseradish. Cochlearia armoracea. This plant 

 is a native of the marshy districts of Great Brit- 

 ain, whence it was introduced into our gardens 

 at an early day, and from the gardens it has es- 

 caped into moist, waste places, in various 

 parts of the country. The generic name is de- 

 rived from cochlear, a spoon ; from the spoon-like, 

 or concave leaves of some of the species. As a 

 condiment, the Horseradish is in general use, 

 and is considered stimulating to the digestive 

 organs. It is extensively grown by the mar- 

 ket gardeners in the vicinity of New York, 

 where it has long been considered one of the 

 most profitable crops. The soil most conducive 

 to it is a light, rich loam. 



Hoteia Japonica. See Spircea Japonica and As- 

 tttbe barbata. 



Hottonia. Water Violet. Named after P. Notion, 

 a Dutch botanist. Linn. Pentandria-Monogynia. 

 Nat. Ord. Primulacece. 



Hardy aquatic or marsh plants. H. inflata is 

 common in pools and ditches from New Eng- 

 land southward. H. palusiris, the Water Violet, 

 is a singular and beautiful plant, common in 

 pools in many parts of England. The leaves 

 grow wholly under water; from them there 

 arises a long flower stalk bearing a pyramid of 

 blue or white flowers, which are disposed in 

 whorls. It is a very interesting plant for the 

 aquarium. 



Houlletia. Named after M. HouM, a French 

 gardener. Linn. Gynandria-Monandria. Nat. 

 Ord. Orchidacece. 



A small genus of very handsome epiphytal 

 Orchids, natives of Brazil. The genus is related 

 to Stanhopea, and requires the same treatment. 



Hound's Tongue. See Oynoglossum. 



Houseleek. See Sempervivum. 



Houstonia. Named in honor of Dr. W. Houston, 

 an English botanist. Linn. Tetrandia-Monogynia. 

 Nat. Ord. Rubiacece. 



This elegant genus of small flowering plants 

 is found throughout the Northern and Western 

 States. They are well adapted for flower bor- 

 ders, rock-work, or shaded beds. They thrive 

 best in a moist situation. The colors of the 

 flowers are white, blue, scarlet, and purple. 

 Herbaceous perennials, popularly known as 

 Bluets. Propagated by division of roots. 



Hovea. Named after A. P. Hove, a Polish botan- 

 ist. Linn. Monaddphia-Decandria. Nat. Ord. 

 Fabacece. 



A genus of handsome, blue-flowered ever- 

 green shrubs from New Holland. " H. Celsi is one 

 of the best known, and 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 during the present: 

 a common condition of leaf buds, which are al- 

 ways visible the season preceding their expan- 

 sion, but not frequently so with flower buds, 

 which, though they may be formed several 

 years before their development externally, gen- 

 erally remain concealed till the period of their 

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

 lary, on short peduncles. Propagated by seeds. 

 Introduced in 1818. 



Hoya. Wax Flower. In honor of Thomas Hoy, 

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

 land at Sion House, England. Linn. Pentan- 

 dria-Digynia. Nat. Ord. Asdepiadacece. 



