flora neotropica - CNCFlora

Systematic Treatment 13
24. Midrib broad towards base, 2-3.5 mm thick; leaves very thick-coriaceous; stipules to
15 mm long, subpersistent; anthers deltoid or nearly so (Venezuela; Guyana; Brazil,
Amazon).
68. L. intrapetiolaris.
24. Midrib narrower towards base, 1-2 mm thick; leaves membranous to coriaceous;
stipules to 8 mm long, persistent to caducous; anthers reniform.
25. Leaf apex long acuminate, base cuneate, petioles eglandular, stipules small, axillary,
leaf base confluent into petiole.
26. Leaves 9-18 cm long x 4.2-7 cm broad; flowers brown pubescent (Surinam;
Brazil, Amazonia).
69.1. L. laevigata.
26. Leaves 4-5 cm long x 2.5-3.8 cm broad; flowers gray pubescent (Brazil,
Amazonia).
69.2. L. occultans.
25. Leaf apex bluntly acuminate, base subcordate, rounded, subcuneate; petioles usually
glandular, leaf base not confluent (Trinidad; Venezuela; Guianas; Amazonia).
69. L. heteromorpha.
2. Petals absent. Sect. Hymenopus.
27. Leaves thin and membranous, the base cuneate, the venation equally prominent on both
surfaces; receptacle urceolate (E-central Brazil).
70. L. glazioviana.
27. Leaves thick and coriaceous, the base usually rounded to cordate, rarely rounded-subcuneate
(to cuneate in L. marleneae), the venation obscure on upper surface; receptacle conical to
globose-cupuliform.
28. Leaves rounded to obtuse at apex, rarely exceeding 9 cm in length.
29. Flowers ca. 3 mm long; petioles terete (E Brazil).
71. L. littoralis.
29. Flowers ca. 2 mm long; petioles usually canaliculate.
30. Inflorescence and flowers with brown pubescence; stamens 3; venation of lower
surface of leaf often papillose; stipules intrapetiolar (Venezuela; Guyana).
72. L. fanshawei.
30. Inflorescence and flowers gray-puberulous or glabrescent; stamens 5; venation of
leaf lower surface smooth-papillose; stipules adnate to extreme base of petiole.
31. Leaf 2.5-6.5 cm long, the apex and base rounded (Guianas). 73. L. irwinii.
31. Leaf 5.5-9.5 cm long, the apex acute, the base cuneate (Brazil, central Amazonia).
73.1. L. marleneae.
28. Leaves distinctly acuminate at apex, usually exceeding 8 cm in length.
32. Midrib slightly impressed above; petioles canaliculate (French Guiana). 74. L. cyathodes.
32. Midrib prominulous above; petioles terete.
33. Flowers 2.5-3.5 mm long, ferrugineous-brown-pubescent; stipules 4-7 mm long,
persistent (Venezuela; Guianas; Brazil, Amazonia).
75. L. polita.
33. Flowers 1.5 mm long, gray-brown-pubescent; stipules small, caducous (Colombia;
Venezuela; Brazil, Para).
76. L. silvae.
1. Leaf underside pubescent, densely arachnoid-lanate or pulverulent-farinaceous-pubescent (not hirsute);
petals absent.
34. Flowers in small cymules, on long slender secondary branches (peduncles) less than 0.5 mm thick
and attached to primary inflorescence branches; pedicels usually 0.25-3 mm long, rarely absent;
fruit often very small, usually not exceeding 2 cm in length.
Sect. Cymosa.
35. Leaf underside with stomatal cavities or thick, coarse, deeply cut venation, lanate-arachnoid.
36. Bracteoles large and enclosing groups of flower buds; flowers subsessile; peduncles of
cymules short and rather thick, 1-3 mm long (Venezuela; Guianas). 7. L. densiflora.
36. Bracteoles small and not enclosing groups of flower buds; flowers pedicellate; peduncles
of cymules long and slender.
37. Inflorescence and exterior of flowers ferrugineous-tomentose; young stems ferrugineous-tomentellous
(fruit 3-5 mm long, stipitate, densely tomentose, in L. cuprea).
38. Flowers ca. 2 mm long; stipules ca. 5 mm long; stamens 3 (Guyana). 78. L. cuprea.
38. Flowers ca. 6 mm long; stipules 7-10 mm long; stamens 6-7 (Brazil, Espirito
Santo).
78.1. L. arianeae.
37. Inflorescence and exterior of flowers gray-puberulous or gray- or brown-tomentose;
young stems glabrous or puberulous (fruit 1-2 mm long, not stipitate).
39. Midrib impressed for entire length; petioles 7-14 mm long; leaves oblong-lanceolate
(Brazil, Amazonia).
79. L. impressa.
39. Midrib plane throughout or impressed at base only; petioles 2-10 mm long; leaves
ovate to oblong.
40. Leaf apex rounded; leaves orbicular-ovate, petioles 8-10 mm long; stamens
7 (E Brazil).
80.1. L. santosii.
40. Leaf apex acute to acuminate; leaves elliptic; petioles 2-7 mm long; stamens
3-7.