Taxon Details: Miconia tacanensis Wurdack
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Narratives:
Family:
Melastomataceae (Magnoliophyta)
Melastomataceae (Magnoliophyta)
Scientific Name:
Miconia tacanensis Wurdack
Miconia tacanensis Wurdack
Primary Citation:
Phytologia 16: 181. 1968
Phytologia 16: 181. 1968
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Description Author and Date: Frank Almeda, based on Almeda, F. (2009). Melastomataceae. In: G. Davidse, M. Sousa-Sânchez, S. Knapp, & F. Chiang (eds.), Flora Mesoamericana: Cucurbitaceae a Polemoniaceae. 4(1): 164-338.
Type: Isotype: Mexico, Matuda 2939 (CAS!).
Description: Tree 3.5-9 m tall, the quadrate to quadrisulcate uppermost cauline internodes, petioles, vegetative buds, young unexpanded leaves, elevated primary leaf veins on the abaxial surface, inflorescence branches and abaxial bracteole surfaces densely to moderately covered with dendritic and asperous-headed hairs. Leaves of a pair equal to somewhat unequal in size; blades 3-5-nerved, oblong-elliptic, 5.7-15.5 x 2.2-5.5 cm, the apex acute to subabruptly acuminate, the base broadly acute to obtuse, the margin entire, the adaxial surface essentially glabrous at maturity, the abaxial surface sparsely covered with asperous-headed and/or dendritic hairs and minute deciduous glands on the vaguely papillose surface; petioles 1.1-4.4 cm long. Inflorescence a multiflowered panicle 8-13 cm long, the flowers 5-merous on pedicels 1-1.5 mm long, the early deciduous bracteoles elliptic to ± obovate and somewhat cucullate, 1-2 x 0.3-0.5 mm. Hypanthium moderately to sparsely stellulate-puberulent. Calyx tube 0.2-0.5 mm long, the oblong-rounded ciliolate lobes 0.5 x 0.50-1 mm; the exterior calyx teeth broadly triangular, 0.5-0.75 x 0.5 mm, appressed to and not projecting beyond the calyx lobes. Petals white, papillose on both surfaces and inconspicuously ciliolate at the margin, broadly obovate to suborbicular, 2-2.5 x 2-3 mm. Anthers isomorphic, yellow, oblong, the thecae 2-2.5 mm long, 4-celled with 2 ventrally inclined pores that are collectively narrower than the width of the anther; the connective thickened dorsally and slightly elevated dorso-basally but not prolonged abaxially the thecae. Style glandular-puberulent, 1.2-3 mm long, stigma peltate with a crateriform apex; ovary 3-locular, 1/3 inferior (at anthesis), the apex elevated into a glandular-puberulent fluted cone and collar 1 mm high. Mature berry and seeds unkown.
Habitat and Distribution: Uncommon in cloud forest. 2000-2800 m. Mexico (Guerrero). MEXICO: Chiapas (Daniel et al. 8428, CAS); GUATEMALA (Breedlove & Almeda 64794, CAS).
Taxonomy and Systematics: Miconia tacanensis is readily recognized by the glandular filaments and style, and the peltate crateriform stigma. Flower buds on the few known collections of this species have well-developed styles and stigmas which appear to be early deciduous and absent from many flowers at anthesis. Based on this observation one may be led to conclude that M. tacanensis might be andromonecious because what appear to be functionally staminate flowers greatly outnumber hermaphroditic ones. Study of natural populations is also needed to determine with certainty whether this species is dioecious.
Notes: [Description based only on Mesoamerican specimens.]
Description Author and Date: Frank Almeda, based on Almeda, F. (2009). Melastomataceae. In: G. Davidse, M. Sousa-Sânchez, S. Knapp, & F. Chiang (eds.), Flora Mesoamericana: Cucurbitaceae a Polemoniaceae. 4(1): 164-338.
Type: Isotype: Mexico, Matuda 2939 (CAS!).
Description: Tree 3.5-9 m tall, the quadrate to quadrisulcate uppermost cauline internodes, petioles, vegetative buds, young unexpanded leaves, elevated primary leaf veins on the abaxial surface, inflorescence branches and abaxial bracteole surfaces densely to moderately covered with dendritic and asperous-headed hairs. Leaves of a pair equal to somewhat unequal in size; blades 3-5-nerved, oblong-elliptic, 5.7-15.5 x 2.2-5.5 cm, the apex acute to subabruptly acuminate, the base broadly acute to obtuse, the margin entire, the adaxial surface essentially glabrous at maturity, the abaxial surface sparsely covered with asperous-headed and/or dendritic hairs and minute deciduous glands on the vaguely papillose surface; petioles 1.1-4.4 cm long. Inflorescence a multiflowered panicle 8-13 cm long, the flowers 5-merous on pedicels 1-1.5 mm long, the early deciduous bracteoles elliptic to ± obovate and somewhat cucullate, 1-2 x 0.3-0.5 mm. Hypanthium moderately to sparsely stellulate-puberulent. Calyx tube 0.2-0.5 mm long, the oblong-rounded ciliolate lobes 0.5 x 0.50-1 mm; the exterior calyx teeth broadly triangular, 0.5-0.75 x 0.5 mm, appressed to and not projecting beyond the calyx lobes. Petals white, papillose on both surfaces and inconspicuously ciliolate at the margin, broadly obovate to suborbicular, 2-2.5 x 2-3 mm. Anthers isomorphic, yellow, oblong, the thecae 2-2.5 mm long, 4-celled with 2 ventrally inclined pores that are collectively narrower than the width of the anther; the connective thickened dorsally and slightly elevated dorso-basally but not prolonged abaxially the thecae. Style glandular-puberulent, 1.2-3 mm long, stigma peltate with a crateriform apex; ovary 3-locular, 1/3 inferior (at anthesis), the apex elevated into a glandular-puberulent fluted cone and collar 1 mm high. Mature berry and seeds unkown.
Habitat and Distribution: Uncommon in cloud forest. 2000-2800 m. Mexico (Guerrero). MEXICO: Chiapas (Daniel et al. 8428, CAS); GUATEMALA (Breedlove & Almeda 64794, CAS).
Taxonomy and Systematics: Miconia tacanensis is readily recognized by the glandular filaments and style, and the peltate crateriform stigma. Flower buds on the few known collections of this species have well-developed styles and stigmas which appear to be early deciduous and absent from many flowers at anthesis. Based on this observation one may be led to conclude that M. tacanensis might be andromonecious because what appear to be functionally staminate flowers greatly outnumber hermaphroditic ones. Study of natural populations is also needed to determine with certainty whether this species is dioecious.
Notes: [Description based only on Mesoamerican specimens.]