HOWARDIA. A genus of trees or shrubs 

 inhabiting tropical America, belonging to 

 the Cinchonacecc, and named in honour of ! 

 Mr. Howard, an eminent English pharma- j 

 cologist. The flowers are remarkable, in 

 that one of the sepals of the calyx is ex- 

 panded into a large heart-shaped stalked 

 leaf. The corolla is tubular and hairy ; the 

 stamens originate from a densely hairy 

 ring ; the ovary is surmounted by a cushion- 

 like disk ; and the fruit is capsular, girt 

 at the top by the remains of the calyx, 

 and bursting from above downwards. 



H. (jOhrysoxylon) febrifuga furnishes a 

 bitter tonic bark, first detected by Mr. 

 Howard, who likewise found that its medi- 

 cinal qualities depended on two chemical 

 principles, one an alkaloid called howard- \ 

 ine, the other a bitter principle. "With re- j 

 ference to the leafy calyx of these and I 

 some allied plants, as Mussoznda, &c, it I 

 may he remarked, that the arrangement 

 of the veins of the leafy sepal is different 

 from that of the true leaves, a fact which 

 has, apparently, been generally over- 

 looked. [M. T. M.] 



HOY A. A genus of Asclepiadacem, con- 

 taining, besides one African species, a 

 large number of species dispersed over 

 tropical Asia. They are herbaceous plants 

 with twining or creeping stems, which 

 throw out roots at the lower nodes. The 



Hoya imperialis. 



leaves are opposite, often, but not in all 

 the species, thick and fleshy; and the 

 flowers are in lateral umbels. Tlie corolla 

 is rotate, the five lobes of the limb are 

 ovate and valvate in the bud. The sta- 

 minal corona consists of five scales in- 

 serted on the gynostegium, and usually 

 spreading horizontally like a star in the 

 centre of the corolla ; the inner anglebears 

 a small tooth incumbent on the anther. 

 The pollen-masses are erect, oblong, and 

 attached in pairs. The stigma is not beaked. 

 The follicles are smooth or with wing-like 

 appendages. The genus contains some of 

 the most ornamental among the plants cul- 

 tivated in our hothouses. £W. C] 



HUACSARO. A Peruvian fern, Elapho- 

 gloss u in Euir. ianum. 



HUCKBERRY. Celtis crassifolia. 



HUCKLEBERRY. Gaylussacia. 



HUDSONIA. Small tufted heath-like 

 North American plants belonging to the 

 Cistacew, among which they are distin- 

 guished by the calyx of five equal sepals, 

 and the one-celled three-valved capsule, 

 containing one to three seeds. Most of 

 the species are downy, with somewhat 

 shrubby, erect stems, closely invested with 

 small narrow imbricated leaves ; the flow- 

 ers are yellow. [C. A. J.] 



HUGELIA. A genus of Californian 

 annuals belonging to the Polemoniacece, 

 and allied to Gilia, from which it is distin- 

 guished by having a short tube to the 

 corolla, and linear arrow-shaped anthers. 

 All the species are more or less clothed 

 with white down, the leaves alternate, and 

 the flowers disposed in heads surrounded 

 at the base with dense wool. Some of the 

 species have blue and yellow flowers. 



The name has also been given to an 

 Australian genus of Butacece, which is said 

 to differ from its congeners in its ten- 

 cleft calyx, its ten petals, and its indefinite 

 perigynous stamens. [C. A. J.] 



HUGONIACE^E. A name given by Arnott 

 to a group of plants now included under 

 Oxalidacece. [J. H. B.] 



HUGONIA. A genus of Oxalidacece, con- 

 sidered the type of a special order by 

 Planchon and others. They are Indian 

 shrubs, with alternate oval leathery leaves, 

 and single-flowered axillary peduncles, 

 often changed into a circinate spine. The 

 flowers have the parts in fives, the stamens 

 being twice as many. The fruit is a fleshy 

 berry or drupe, with Ave pips. The roots 

 of H. Mystax smell like violets, and are 

 said to acton the kidneys and skin ; they 

 are used in reducing inflammation, and as 

 a remedy for the bite of snakes. [J. T. S.] 



HTJILE ANTIQUE DE LAVANDE. (Fr.) 

 A perfumery oil, forming one of the in- 

 gredients of Eau de Cologne. — DE 

 CADE. A tarry oil obtained from Juiii- 

 perus Oxycedrus. — DE CEDRAT. An 

 essential oil obtained from the citron. — 

 DES MARMOTTES. An oil obtained from 

 the kernel of Prunus Brigantiaca. 



HULDEE. An Indian name for Cur- 

 cuma longa. 



HULST. Ilex Aquifolium. 



HULVER. Ilex Aquifolium. — , KNEE. 

 Buscus aculeatus. — , SEA. Eryngium 

 maritimum. 



HUMATA. A small genus of creeping 

 davallioid ferns, sometimes referred indeed 

 to Davallia itself, but having more of the 

 technical character of Cystopteris. They are 

 variable in character, having simple, Jobed, 

 pinnatifid, pedately pinnatifid, or subter- 

 nate rigid leathery fronds. The son', which 

 are covered by suborbicular-reniform or 

 transversely oblong reniform indusia, affix- 

 ed only by their broad base, are usually ver- 

 tical at the apex of the veins, but sublateral 

 in H. Gaimardiana. The species are mostly 



