LI. MYRTACEiE. 
573 
Subtribe II. Caly thrice®. — Stamejis indefinite, few or numerous, free, in several rows, the 
inner ones shorter, without staminodia. Ovules 2, collaterally attached to a filiform placenta, 
extending from the base to the summit of the cavity . Embryo straight, very shortly divided into 
2 small cotyledons at the summit. 
Calyx-lobes persistent, or rarely falling off with the upper portion of the 
tube, terminating in a long bristle or rarely in a short point. Ovules 2, 
on a filiform placenta attached both to the base and summit of the 
ovary 4. Calythrix. 
Subtribe III. Thryptomenese.— Stamens 5, 10, or indefinite, free, in one or several rows, 
without staminodia. Ovules 2, rarely 4 to 10, attached in 2 rows to a placenta, either basal or 
adnate to the side of the cavity or extending to the summit of the cavity. Embryo, where known, 
very thick, with a slender neck inflected and divided at the end into 2 small cotyledons. 
(The three genera here included have the habit and embryo of Bceckea, with the 1 -celled ovary 
of Euchamalauciece. — Benth.) 
Calyx-lobes short, deciduous. Ovules 2, the placenta basal or adnate to 
one side of the ovary 5. Homalocat.yx. 
Stamens 5 or 10, regularly alternate with or opposite to the calyx-lobes, 
quite distinct and without staminodia. 
Ovules 2 or more, ascending or attached to a lateral placenta. Stamens, 
when 5, alternate with the petals 6. Thryptomene. 
Ovules 2 or 4, pendulous from the summit of a filiform placenta. Stamens, 
when 5, opposite to the petals 7.' Micromyrtus. 
Tribe II. Leptosperme*.— Ovary divided into 2 to 5, or rarely more cells. 
Capsule opening at the summit loculicidally in as many valves as there are cells, 
or very rarely indehiscent, with 1 or 2 seeds. 
Subtribe I. BseckeaBae . — Leaves opposite, usually small. Flowers usually small, pedicel- 
late or subsessile, solitary or few in a small cyme, umbel, or head in the axils of the leaves, some- 
times forming a terminal head with the floral leaves reduced to bracts. Stamens definite, or, if 
indefinite, usually in a single row, free or united at the base in a ring, or into clusters alternating 
with the petals (not opposite the petals as in other subtribes), and usually shorter than the petals. 
Ovules usually in 2 rows. Embryo with a thick radicle, produced at the opposite end into a slender 
incurved neck, or into a short point with very small often minute cotyledons. 
(The most constant character of this subtribe is probably that derived from the embryo, in 
which, so far as known, the cotyledons are always minute, whilst in the following subtribes they 
are as long as or longer than the radicle. — Benth.) 
Stamens in a single row, definite or indefinite, shorter than or rarely shortly 
exceeding the petals, free or united in bundles, alternating with the 
petals. Leaves small or narrow, opposite. Ovules several in each cell, in 
2 rows or in a ring round a peltate placenta, or, if 2, collateral. Flowers 
small, axillary, solitary, or rarely few, on a common peduncle. Stamens 
free, rarely exceeding 20, and usually much fewer 8. Bjeckia. 
Subtribe II. Euleptospermeae . — Leaves scattered or rarely opposite, small or narrow 
and coriaceous, 1 or more-nerved, rarely penniveined. Flowers solitary in the axils of the leaves 
or bracts, closely sessile except in a very few species. Stamens indefinite, in 1 or more rows, free 
or united in bundles opposite the petals, or very rarely definite. Anthers versatile, with distinct 
parallel cells. Ovules in 2 or more rows in each cell of the ovary. Embryo straight or slightly 
incurved, the cotyledons usually longer than the radicle. 
Stamens in a single row, definite or indefinite, shorter than or rarely shortly 
exceeding the petals, free or united in bundles, alternating with the 
petals. Leaves small or narrow, alternate. 
Stamens free, definite, or, if indefinite, none opposite the centre of the 
petals. Flowers in globular sessile heads 9. Agonis. 
Stamens numerous, in a continuous series. Flowers solitary or crowded, 
but not in heads 10. Leptospermum. 
Stamens exceeding the petals, indefinite, either free or united in bundles, 
opposite the petals. Leaves small or narrow, or rarely large and many- 
nerved. Flowers closely sessile (except in some species of Kunzea ). 
Anthers versatile, with parallel cells, opening longitudinally. 
Stamens free (almost in 5 bundles in 1 species of Callistemon). 
Calyx-lobes usually persistent. Ovary 2 to 5-celled. Seeds pendulous. 
Flowers in heads or solitary, or rarely in short spikes 11. Kunzea. 
Calyx-lobes usually deciduous. Ovary 3 or 4-eelled. Seeds ascending. 
Flowers in spikes, terminal or crowned by the year’s shoot .... 12. Cat.ustemox. 
