Celastraceae
The Celastraceae are trees and shrubs comprising
about 50 genera and 800 species that are sometimes climbing or vining. The leaves are
simple and alternate or opposite; stipules are small and caducous or absent. The flowers
are bisexual or sometimes functionally unisexual, actinomorphic, and are small and often
greenish. The calyx comprises 4 or 5 usually basally connate sepals. The corolla is rarely
absent or more commonly consists of 4 or 5 distinct petals. The androecium consists of 4
or 5 or rarely 10 distinct stamens that alternate with the petals. The gynoecium is a
single compound pistil of 2-5 carpels, a single short style, and a superior or rarely half
inferior ovary with 2-5 locules, each containing usually 2 axile ovules. An annular
nectary disk surrounds and is usually adnate to the ovary. The fruit is a capsule, berry,
samara, or drupe.
Each "thumbnail" image below is linked to a larger photograph.
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Catha sp. In this species the annular nectary disk is visible as
a light greenish ring around the darker green ovary. The alternate stamens arise from just
outside the disk. The flowers in the lower right exhibit 3-lobed stigmas and indicate the
3-carpellate nature of the gynoecium in this example. |
|
Celastrus sp. Note greenish, 4-parted flowers with conspicuous
nectary disk and alternate stamens. |
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Elaeodendron orientale. In this species the ovary is completely
buried in the nectary disk. The developing fruit in the background clearly reveals the
superior nature of the ovary. |
|
Euonymus japonicus. Note minute stipules in first photo;
alternate stamens and conspicuous nectary disk in second photo. |
|
Perrottetia sandwicensis, olomea. The flowers of this Hawaiian
native member of the family are reddish but are still very small. The disk is visible as a
yellow ring around the emergent style. |
|
Salacia naumanii. |
|
Celastraceae. |
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