Systematics of the Octopleura Clade of Miconia (Melastomataceae: Miconieae) in Tropical America
Gamba, Diana
Almeda, Frank
Phytotaxa
2014
2014-09-24
179
1
1
174
Grisebach
1860
[449,584,332,357]
Magnoliopsida
Melastomataceae
Octopleura
GBIF
Plantae
Myrtales
33
34
Tracheophyta
genus
3.
11. Leaves markedly to more or less anisophyllous in each pair, petiolate; indumentum on uppermost internodes asperous with dendritic trichomes or arachnoid with sessile-stellate trichomes; petals rounded to rounded-truncate at the apex, densely papillose on both surfaces; seeds with the raphal zone notably expanded ventrally and longitudinally ............................ 12. - Leaves essentially isophyllous in each pair, petiolate or subsessile (if subsessile then the indumentum on uppermost internodes asperous with dendritic trichomes); indumentum on uppermost internodes puberulent-dendritic, mealyfurfuraceous, squamate, thickened-claviform, tomentose, or hispid; petals bluntly acute to acuminate at the apex, glabrous with trichomes only on the abaxial surface, or with trichomes on both surfaces but with different trichome typeson each surface; seeds with the raphal zone only moderately expanded ventrally at one side (micropylar or chalazal)................. 19. 12. Leaves of each pair markedly anisophyllous in size and shape, with a thick-callose vesicular structure at the abaxial blade base where the innermost pair of secondary veins diverge from the primary vein; leaf margins eciliate; indumentum on primary and secondary abaxial foliar veins appearing arachnoid with sessile-stellate trichomes ...................................... 13. - Leaves of each pair slightly anisophyllous only in size, lacking callose vesicular structures at the abaxial blade base where the innermost pair of secondary veins diverge from the primary vein; leaf margins ciliate (except for some individuals of M. atropurpurea); indumentum on primary and secondary abaxial foliar veins asperous with dendritic trichomes that have a short axis and few-moderate number of terete arms......................................................................................................... 15. 13. Larger leaf at each node elliptic-oblong and falcate, 3–5-nerved ......................................................................... M. radicans - Larger leaf at each node broadly ovate to subrotund, or oval-orbicular, 5–7-nerved ......................................................... 14. 14. Hypanthia 2.8–2.9 mmlong at anthesis, cylindric to campanulate and not constricted distally, resinous-glandular with slightly furrowed more or less stalked glands; calyx teeth to 0.2 mmlong and not projecting beyond the calyx lobes......... ........................................................................................................................................................................ M. erikasplundii - Hypanthia 3.2–3.4 mmlong at anthesis, urceolate and constricted distally into a subcylindric neck, arachnoid with appressed matted sessile-stellate trichomes; calyx teeth 0.7–0.8 mmlong and projecting beyond the calyx lobes................ ............................................................................................................................................................................ M. biolleyana 15. Hypanthium at anthesis beset with asperous dendritic trichomes, densely intermixed with elongate smooth trichomes but lacking glands of any kind .............................................................................................................................. M. atropurpurea - Hypanthium at anthesis copiously beset with resinous slightly furrowed more or less stalked glands intermixed with asperous dendritic and/or elongate smooth trichomes in variable quantities ...................................................................... 16. 16. Blade base attenuate to oblique, conspicuously and narrowly decurrent on the petiole; torus copiously resinous-glandular adaxially ............................................................................................................................................................................. 17. - Blade base rounded to obtuse, not decurrent on the petiole; torus moderately to densely ciliate adaxially....................... 18. 17. Inflorescence axes greenish; flowers 4-merous; hypanthium green-whitish; ovary 4-locular; berries bright-orange at maturity ................................................................................................................................................................. M. aguilarii - I nflorescence axes pinkish; flowers 5-merous; hypanthium yellowish becoming bright pink; ovary 5-locular; berries purple-black at maturity ............................................................................................................................... M. quinquenervia 18. Adaxial foliar surface sparsely to moderately strigose with pinkish subulate-smooth trichomes; hypanthium densely setose with pinkish subulate-smooth trichomes; exterior teeth ca. 1 mmlong including the apical trichome, bluntly conic and 1–3-aristate ............................................................................................................................................................ M. reitziana - Adaxial foliar surface glabrate; hypanthium not setose with only slightly furrowed more or less stalked glands; exterior teeth ca. 0.5 mmlong, subulate and lacking aristae ........................................................................................ M. neocoronata 19. Leaves subsessile, the blade base cordate-amplexicaul, not decurrent on the petiole........................................................ 20. - Leaves petiolate or subsessile, if subsessile the blade base decurrent on the petiole, if the base cordate then not amplexicaul and the leaves petiolate ................................................................................................................................... 22. 20. Leaves ovate-lanceolate; hypanthium at anthesis copiously resinous with slightly furrowed more or less stalked glands, the torus glabrous adaxially; exterior calyx teeth 1.3–1.5 mmlong, linear-subulate and projecting beyond the calyx lobes....... .................................................................................................................................................................................. M. incerta - Leaves elliptic to oblong-elliptic; hypanthium not resinous-glandular, the torus copiously resinous-puberulent with slightly furrowed more or less stalked glands adaxially; exterior calyx teeth 0.2–0.5 mm, bluntly triangular and not projecting beyond the calyx lobes ........................................................................................................................................................ 21.