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HEVEA 
side, when, as was shown some years ago, there is a larger flow of 
milk than at first. The milk is usually coagulated with the aid of 
enough acid to neutralise its alkalinity, and the resulting “ biscuits” 
are dried, or (more lately) pressed together into a block containing 
about io % of water, which appears to strengthen the rubber. 
Hexaptera Hook. Cruciferae (i. 2). 6 sp. temp. S. Am. Fruit winged. 
Hibbertia Andr. (incl. Candollea Labill. 1806). Dilleniaceae. 100 sp. 
Austr., New Caled. &c. Mostly shrubs of ericoid or climbing habit. 
Some sp. have phylloclades. Infl. dichasial, but often, by reduction, 
coming to look like a raceme. The sta. &c. vary much in number in 
different sp. (see Nat. PJi . ). 
Hibiscus Linn. (incl. Abelmoschus Medic.). Malvaceae (iv). 150 sp. 
trop. and sub-trop. The 5 ante-sepalous sta. are represented by teeth 
at the top of the stamen-tube. Several sp. are cultivated, especially 
H. Rosa-sinensis L. (firs, showy), H. Sabdariffa L. (Rozelle, fruit for 
jelly, &c.), H. (A.) esculentus L. (Okra or Bandakai, mucilaginous 
young fruit in soups, &c.). 
Hieracium (Tourn.) Linn. Compositae (xm). 400 sp. N. Hemisph., 
S. Afr., Andes. There are several sp. in Brit, (hawk-weeds), which, 
especially in Scotland, vary very much ; innumerable varieties have 
been raised by various botanists to specific rank (see London Cat, of 
Brit. Plants , 9th ed.). Some are parthenogenetic. 
Hierochloe S. G. Gmel. Gramineae (vn). 13 sp. temp, and frigid. 
(1 Brit., rare.) 
Higginsia Pers. = Hofifmannia Sw. 
Hildebrandtia Vatke. Convolvulaceae (1. 3). 2 sp. Afr. 
Himantoglossum Spreng. = Orchis Tourn. 
Hinterhubera Sch. Bip. Compositae (ill). 3 sp. Andes. 
Hippeastrum Herb. Amaryllidaceae (1). 50 sp. trop. and sub-trop. Am. 
Favourites in cultivation. 
Hippia Linn. Compositae (vii). 4 sp. S. Afr. 
Hippocastanaceae. Dicotyledons (Archichl. Sapindales). Only genus 
Aesculus (q-v.). United to Sapindaceae by Benth.-Hooker. 
Hippocratea Linn. Hippocrateaceae. 70 sp. trop. Twining shrubs. 
Hippocrateaceae. Dicotyledons (Archichl. Sapindales). 3 gen. with 
1 50 sp. trop. and sub-trop. Shrubs, mostly lianes, with opp. or alt. 
simple leaves. Firs, in cymes, g > regular, with disc. K 5, C 5, A3 
(rarely 5, 4, 2), G (3), with 2 — 10 anatropous ovules in each loc. 
Berry or schizocarp. No endosperm. Genera: Campylostemon, 
Hippocratea, Salacia. [United to Celastraceae by Benth.-Hooker; 
placed in Frangulinae by Warming.] 
Hippocrepis Linn. Leguminosae (ill. 7). 12 sp. Medit. fJ. comosa 
L. extends to Scotland. The mechanism of the fir. is like that of 
Lotus, but on the claw of the standard is a triangular flap closing the 
entrance to the honey. Bees must lift the standard to reach the honey 
and so cannot avoid making the mechanism work properly. 
