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Species of Uvariastrum. a Uvariastrum insculptum, Ivory Coast (photo O. Lachenaud, no specimen) b Uvariastrum pierreanum, fruit, Gabon (photo: TLP Couvreur, (Sosef 2034)) c Uvariastrum pierreanum, Cameroon (photo: TLP Couvreur; Couvreur 454) d Uvariastrum zenkeri; cauliflorous flowers; Cameroon (photo: XM van der Burgt (van der Burgt 590)) e Uvariastrum zenkeri, flower bud; Cameroon (photo Sonneck, no specimen) f Uvariastrum zenkeri, mature flower; Cameroon (photo Sonneck, no specimen) g Uvariastrum zenkeri, detail of receptacle; Cameroon (photo Sonneck, no specimen).
Stamen and pollen morphology in Uvariastrum. a detail of connective shield in Uvariastrum insculptum (Breteler 5811) b pollen grain of Uvariastrum insculptum (Breteler 5811) c pollen grain of Uvariastrum germainii (Lebrun 5977) d pollen grain of Uvariastrum hexaloboides (Breteler 11894) e pollen grain of Uvariastrum zenkeri (Bos 6266) f Pollen grains of Uvariastrum zenkeri in connective shield (Bos 6266).
Uvariastrum pierreanum. A Flowering branch B cauliflorous flower C Transversal cut of flower showing carpels and stamens D detail of sepals E detail of carpels and ovule placentation; stamen G fruit. Uvariastrum inscultptum H Flowering branch I flower bud J sepals K carpel L stamen M fruits. Drawing Helène Lamourdedieux, modified from La Flore du Gabon, Fig. 53. 1969.