Byrsonima rubrobracteata W.R.Anderson
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Authority
Maguire, Bassett. 1978. The botany of the Guayana Highland--part XI. Mem. New York Bot. Gard. 32: 1-391.
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Family
Malpighiaceae
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Scientific Name
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Description
Latin Diagnosis - Frutex usque 5 m altus, ramis vegetativis glabris praeter axiHas hirsutas stipularum. Lamina foliorum majorum 5.5-10 cm longa, 3-6 cm lata, elliptica vel obovata, basi attenuata, margine revoluta, apice rotundata vel paulo apiculata vel retusa, glabra, coriacea, nervis reticuloque subtus obscuris, supra obscuris vel prominuHs; petiolus 10-15 mm longus, glaber; stipulae 3.5-5 mm longae, liberae, late ovatae, abaxialiter glabrae, adaxialiter sparsim sericeae. Inflorescentia 4-5 cm longa, appresso-tomentosa, floribus singulis et pro parte maxima in dimidio distall confertis, bracteis 2.5-3.5 mm longis latisque, late ovatis, rubris, appressis vel paulo revolutis, glabris praeter marginem ciliatam, post maturitate fructus persistentibus, pedunculo nullo, bracteolis bracteis similaribus vel paulo minoribus. Pedicellus 9-13 mm longus, appresso-tomentosus, in alabastro circinatus, in fructu rectus. Sepala omnia biglandulifera, glandulas ca 2 mm superantia, 2.5-3 mm lata, apice rotundata, carnosa, appressa apice revoluta, abaxialiter proximaliter sparsim sericea, margine ciliata, adaxialiter glabra, in fructu rosea et moderate accrescentia, glandulis alboroseis 2-2.5 mm longis. Petala alba demum rosea vel rubra, glabra. Filamenta 2.6-2.9 mm longa, abaxialiter glabra, adaxialiter basi brevihirsuta; antherae 1.4-1.7 mm longae, loculis 1-1.4 mm longis, dorsiventraHter complanatis et anguste alatis, connectivo rhomboideo, loculos 0.3-0.4 mm superanti. Ovarium glabrum, carpellis omnibus fertilibus; styli ca 3 mm longi. Fructus immaturus viridis, 6-7 mm diametro (siccus), globosus vel ovoideus, glaber, calyce rubro accrescenti subtentus, nuce rugosa.
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Discussion
Type. Tillett, Tillett & Boyan 45128, low forest (8-10 m) on shoulder of E flank, about [sic] Thompson Camp, Mt. Ayanganna, upper Mazaruni River basin, 1418 m, 14 Aug 1960 flr/frt (holotype MICH, isotypes K, NY, US). This species is similar to Byrsonima concinna, from which it differs in its red bracts and bracteoles, its short, dense inflorescence with only one flower per bract, the long stipules only sparsely sericeous adaxially, and the coriaceous, revolute lamina, which is ± rounded at the apex and has the reticulum obscure below.