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Manual de Plantas de Costa Rica

Main | Family List (MO) | Family List (INBio) | Cutting Edge
Draft Treatments | Guidelines | Checklist | Citing | Editors

The Cutting Edge

Volume XII, Number 3, July 2005

News and Notes | Recent Treatments | Leaps and Bounds | Germane Literature | Season's Pick | Annotate your copy

SEASON'S PICK: Clusia croatii D'Arcy (Clusiaceae) et others of section Retinostemon.

Clusia croatii -- Hammel 14221 Clusia croatii -- Hammel 23665

Both Clusia croatii (staminate flower, above left--Hammel 14221, mature open fruit
with arrilate seeds, above right--Hammel 23665)

Clusia uvitana -- Hammel 9113 Clusia uvitana -- Hammel 17080

and C. uvitana Pittier (staminate flower, above left--Hammel 9113, pistillate flower above right--Hammel 17080), are members of the Clusia minor L. group (=section Retinostemon), one of the many groups of Clusia characterized, in part, by the production of floral resins. Although detailed pollination studies for this group are lacking, sporadic observations indicate that small Meliponid bees, taking both pollen and resin, are the primary floral visitors.

Clusia croatii -- McPherson 6702 Clusia uvitana -- Dwyer 1817

From young buds of the staminate flowers of these species (C. croatii, above left--Mcpherson 6702, C. uvitana, above right--Dwyer 1817), it is obvious that the resin is produced by the expanded connective of the central stamens. The resin of pistillate flowers in this group is produced by the staminodial ring that surrounds the base of the ovary.

Clusia_minor Clusia minor

Oddly (virtually all Clusia are dioecious), C. minor itself is morphologically hermaphroditic; all flowers are pistillate and all have at least a few pollen producing anther sacs in the staminodial ring--Hammel 22418.

All the species mentioned above are flowering and fruiting during this part of the rainy season. All photos are by B. Hammel.

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