HU T CHINSIA 
4i3 
Hoteia C. Morr. et Dcne = Astilbe Buch.-Iiam. 
Hottonia Boerh.ex Linn. Primulaceae (1). 2 sp., one in N. Am., the 
other, H. palustris L. (water- violet), in Siberia and Eur. (incl. Brit.). 
Floating water-plants (p. 158) with finely-divided submerged leaves. 
The firs, project above the water; they are dimorphic like those of 
Primula. Winter buds form as in Utricularia, &c. 
Houstonia Gronov. ex Linn. Rubiaceae (1. 2). 20 sp. west N. Am. 
Firs, heterostyled as in Primula, with similar differences in stigma 
and pollen. 
Houttuynia Thunb. Saururaceae. 2 sp. N.W. Am. and E. As. 
Howea Becc. Palmae (iv. 6). 2 sp. Lord Howe’s Island. 
Hoya R. Br. Asclepiadaceae (11. 4). 70 sp. Indo-mal., Austr. Twiners 
and root-climbers with fleshy leaves. Hothouse favourites on account 
of their handsome firs, (wax-flowers). 
Hudsonia Linn. Cistaceae. 3 sp. N. Am. 
Huernia R. Br. Asclepiadaceae (11. 4). 20 sp. Cape Col. to Arabia. 
Like Stapelia, but stem 4- to 6-angled. 
Hugonia Linn. Linaceae. n sp. trop. Old World. The lower twigs 
of the infl. are modified into hooks for climbing (p. 172). 
Humboldtia Vahl (Batschia Vahl). Leguminosae (11. 3). 4 sp. 
Ceylon and Further Ind. H. laurifolia Vahl is myrmecophilous 
(p. 1 15). The non-flowering twigs are normal, but those that bear 
firs, have hollow obconical internodes. In each of these, at the top, 
opposite the leaf, is a slit leading to the cavity which is inhabited by 
ants. 
Humea Sm. Compositae (iv). 4 sp. S. Austr. 
Humiria Jaume St. Hil. Humiriaceae. 3 sp. trop. Am. 
Humiriaceae. Dicotyledons (Archichl. Geraniales). 3 gen. with 18 sp., 
trop. Am., Afr. Separated from Linaceae by the bilocular anthers 
and usually 00 sta. (See Nat. PJl .) Chief genera: Humiria, Sacco- 
glottis. 
Humulus Linn. Moraceae (iv). 2 sp. N. temp. Perennial climbing 
herbs. Infl. cymose, dioecious, the <? a much-branched pseudo- 
panicle, the ? a few-flowered pseudo-catkin with 2 firs, in the axil of 
each scale. Fir. protogynous and wind fertilised. Fruit an achene. 
H. Lupnlus L. is the hop, largely cultivated in Kent and elsewhere; 
the fruit is used in brewing, &c. 
Hunnemannia Sweet. Papaveraceae (1). 1 sp. Mexico. 
Hura Linn. Euphorbiaceae (A. II. 7). 2 or 3 sp. trop. Am., of which 
the best known is H. crepitans L., the sand box tree. The fruit is 
as big as an orange with numerous hard woody cpls. Each, as the 
ripe fruit dries, tries to expand from the A shape to a U shape. 
Presently a violent explosion occurs and the seeds are shot out, 
sometimes to a distance of 30 yards. The fruits used to be wired 
together and used as sand boxes before the era of blotting-paper. 
Hutchinsia R. Br. Cruciferae (iv. 14). 8 sp. N. temp. (1 in Brit.) 
