Hypocalymma
(from hypo, under, and kalymma, a veil; calyx falling off like a veil or cape). ORD. Myrtaceoe. A genus containing twelve species of ornamental greenhouse evergreen shrubs, limited to Western Australia. Flowers axillary, in pairs, or rarely three or four together in each axil, sessile or shortly pedunculate, with three scarious bracts or bracteoles under each flower. Leaves opposite, usually larger than in Boeckea, entire, or with crisped edges. The species require a compost of loam and peat, to which a little sand is added. Cuttings of young shoots will root in sand, under a bell glass. Probably the two species here described are the only ones yet introduced. H. angustifolium (narrow-leaved). fl. white or pale pink, in sessile pairs, but often in the axil of one only of each pair of leaves. May. l. narrow-linear, rigid, channelled above or semiterete, rarely rather broader and concave, obtuse or acute. h. 1ft. to 3ft. 1843. SYN. H. suave (under which name it is figured in B. R. 1844, 28).
H. robustum (robust). fl. pink, axillary, on short pedicels; heads many-flowered. May. l. linear-lanceolate, mucronate. h. 2ft. 1842. (B. R. 1842, 8.) H. suave (sweet). A synonym of H. angustifolium.