Rogersonanthus

Primary tabs

Rogersonanthus

Content

<<<Flowers>Calyx>Apex>Shape

obtuse1
1. 004-002-005-001

<<<Flowers>Calyx>Fusion>Relative distance

up to ca. 3/4 of length2
2. 004-002-001-001

<<<Flowers>Calyx>Lobes>Shape

elliptic, with a thickened dorsal and glandular area3
3. 004-002-004-001

<<<Flowers>Stamens>Anthers>Shape

lanceolate4
4. 004-006-002-001

<<<Flowers>Stamens>Connective apex>Shape

obtuse5
5. 004-006-003-001

<<<Fruits>Seeds>Testa pattern>Shape

concave and convex cells and rimmed edges (unwinged)6
6. 005-001-002-001

<<Flowers>Calyx>Apex

apex ;7
7. 004-002-005

<<Flowers>Calyx>Fusion

fused from base8
8. 004-002-001

<<Flowers>Calyx>Lobes

lobes ,9
9. 004-002-004

<<Flowers>Calyx>Shape

campanulate10
10. 004-002-003

<<Flowers>Calyx>Texture

coriaceous11
11. 004-002-002

<<Flowers>Corolla bud apex>Shape

rounded12
12. 004-003-001

<<Flowers>Corolla>Fusion

fused at base13
13. 004-004-001

<<Flowers>Corolla>Length

21-45 mm long14
14. 004-004-004

<<Flowers>Corolla>Shape

funnel-shaped to narrowly salver-shaped15
15. 004-004-003

<<Flowers>Corolla>Texture

coriaceous and fleshy16
16. 004-004-002

<<Flowers>Pistil>Stigma

stigma bilamellate.17
17. 004-008-001

<<Flowers>Stamens>Anthers

anthers ,18
18. 004-006-002

<<Flowers>Stamens>Base

base of filaments without appendages,19
19. 004-006-001

<<Flowers>Stamens>Connective apex

connective apex ;20
20. 004-006-003

<<Fruits>Seeds>Shape

angular21
21. 005-001-001

<<Fruits>Seeds>Testa pattern

testa pattern with .22
22. 005-001-002

<<Leaves>Vein number>Vein number

1-9-veined23
23. 002-002-001

<Flowers>Androecium

androecium zygomorphic with stamens and style bent towards bottom of corolla mouth;24
24. 004-005

<Flowers>Calyx

calyx , , ,25
25. 004-002

<Flowers>Corolla

corolla , , , ;26
26. 004-004

<Flowers>Corolla bud apex

corolla bud apex ;27
27. 004-003

<Flowers>Merosity

5-merous28
28. 004-001

<Flowers>Pistil

pistil with nectary disk around base,29
29. 004-008

<Flowers>Pollen

pollen in tetrads;30
30. 004-007

<Flowers>Stamens

stamens inserted in lower half of corolla tube, of unequal length,31
31. 004-006

<Fruits>Seeds

seeds ,32
32. 005-001

<Inflorescences>Bracts and bracteoles

bracts and bracteoles scale-like.33
33. 003-002

<Inflorescences>Position

terminal34
34. 003-001

<Leaves>Length

19-143 mm long35
35. 002-001

<Leaves>Vein number

.36
36. 002-002

Description

Shrubs or trees. Leaves sessile or shortly petiolate, 19-143 mm long; 1-9-veined. Inflorescences terminal, a small dichasium; bracts and bracteoles scale-like. Flowers pedicillate, 5-merous, actinomorphic; calyx fused from base up to ca. 3/4 of length, coriaceous, campanulate, lobes elliptic, with a thickened dorsal and glandular area, apex obtuse; corolla bud apex rounded; corolla fused at base, coriaceous and fleshy, funnel-shaped to narrowly salver-shaped, 21-45 mm long; androecium zygomorphic with stamens and style bent towards bottom of corolla mouth; stamens inserted in lower half of corolla tube, of unequal length, base of filaments without appendages, anthers lanceolate, connective apex obtuse; pollen in tetrads; pistil with nectary disk around base, stigma bilamellate. Fruit a capsule, with persistent calyx and deciduous corolla; seeds angular, testa pattern with concave and convex cells and rimmed edges (unwinged).

Distribution

Guyana present, Neotropics present, Trinidad present, tepuis in Venezuela and Guyana present
2 species from the Neotropics, from tepuis in Venezuela and Guyana, and Trinidad; 1 species in Guyana.

Flowers

Flowers pedicillate, , actinomorphic;37
37. 004

Fruits

Fruit a capsule, with persistent calyx and deciduous corolla;38
38. 005

Habit

Shrubs or trees.39
39. 001

Inflorescences

Inflorescences , a small dichasium;40
40. 003

Leaves

Leaves sessile or shortly petiolate, ;41
41. 002

Notes

Rogersonanthus was segregated from Macrocarpaea by Maguire & Boom (1989), based on the presence of pollen tetrads instead of pollen monads (Nilsson, 1968); the segregation is supported by phylogenetic analyses (Struwe et al., 2009). The species Rogersonanthus coccineus Steyerm. ex Struwe, S. Nilsson & V.A. Albert is excluded from this genus and included in Roraimaea Struwe, S. Nilsson & V.A. Albert (Struwe et al., 2008).