Annona trunciflora R.E.Fr.
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Authority
Maguire, Bassett & Wurdack, John J. 1957. The Botany of the Guiana Highland -- Part II. Mem. New York Bot. Gard. 9 (3): 235-392.
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Family
Annonaceae
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Scientific Name
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Description
Latin Diagnosis - Arbor ca. 7 m alta; ramuli novelli rubescentes, pilis ± adpressis rubro-ferrugineis vestiti; internodia 1.5-2 cm longa. Petiolus 0.6-1 cm longus, supra canaliculatus; lamina rigide coriacea, exsiccata supra nigrescens et lucida, subtus olivacea, oblanceolato-obovata, basin versus cuneato-acutata et decurrens, apice breviter acutata et cuspide 0.5-1 cm longa instructa, 8-12 cm longa et 3-4 cm lata; costa supra impressa, subtus valde prominens rugosa; nervi laterales I. utrinque 7-9, supra paulo impressi, subtus elevati, 2-3 mm intra marginem arcuato-conjuncti; reticulum venularum praecipue subtus impressum. Flores e trunco exeuntes; pedicelli recti, rigidi, ca. 3 cm longi et 2-3 mm crassi, apicera versus paulo incrassati, dense ferrugineo-tomentelli, prope basin articulati. Sepala in discum integrum 10-12 mm latum coalita, extus dense ferrugineotomentella, intus glabra. Petala exteriora valvata, crassa, rigida, ovata, acutiuscula, extus densissime sericea, intus breviter tomentella, 3-3.5 cm longa et 2-2.5 cm lata; petala interiora marginibus tenuibus imbricata, exterioribus ± aequilonga, utroque latere breviter densissime cinereo-tomentella. Stamina numerosissima, filamento 1-1.5 mm longo incluso 4-4.5 pim longa; connectivi appendice truncato-semiglobosa minute papillosa; pollinis grana miniata. Ovaria numerosa, sub anthesi non coalita, linearia, ca. 3 mm longa, dense ferrugineasericea, stigmate minuto acuto glabro. (Fructus ignotus.)
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Discussion
TYPE: VENEZUELA: Estado Bolivar, occasional in forest at Raudal Maraca (about 110 river km from mouth), Rib Parguaza, elev. 115 m, Dec. 31, 1955, J. J. Murdoch & J. V. Monacbino 41044. (NY).
Unfortunately the material of this species is incomplete, as fruits are missing. However the flower material is rich and it shows that the type belongs to the genus Annona. According to the revision of the sections of Annona, published by the author in Acta Horti Bergiani 10: 198 (1931) this new species must be placed in section Eu-Annona, even if the pocket-shaped pits in the nerve angles on the back side are very small. In the vegetative parts the new species agrees also rather much with the section Psammogenia, especially in the impressed network of the veins. However, the imbricate aestivation of the inner petals does not agree with the valvate inner petals of Psammogenia. The most remarkable character for the new species is the cauliflory, with the flowers situated on the stem.