Rytigynia Blume

Genus

Angiosperms > Gentianales > Rubiaceae

Characteristics

Shrubs or small trees, occasionally somewhat scrambling; stems spiny in a few species, usually distinctly lenticellate. Leaves opposite or occasionally in whorls of 3, particularly in some forms of R. celastroides, petiolate, often with domatia in axils of nerves beneath; stipules connate at the base, oblong or triangular, villous within, often ± persistent, ending in a mostly linear or subulate ± deciduous appendage. Flowers mostly 5-merous, small, usually white, yellowish or greenish, axillary, solitary or in 2–10(–15)-flowered sometimes umbel-like cymes; peduncles and pedicels mostly well developed; bracts and sometimes bracteoles present, small; sometimes inflorescence-axes scarcely developed and flowers appear fasciculate. Buds obtuse, acute or conspicuously long-apiculate, glabrous or pubescent outside. Calyx-tube ± subglobose, the limb short, truncate or denticulate only, distinctly lobed in a few species mostly in distinctive subgenera, mostly persistent on the young fruit. Corolla-tube cylindrical, glabrous or hairy within for part or most of length or with a ring of deflexed hairs in the middle; lobes shorter than to longer than the tube, acute to very distinctly long-apiculate or with a filiform appendage. Stamens slightly to distinctly exserted; anthers often mucronate or slightly appendaged, often papillate; filaments very short. Ovary mostly 3–5(–6)-locular, but 2-locular in some species; style usually exserted, slightly swollen at base; stigmatic club coroniform, subglobose or occasionally cylindrical, sulcate beneath where in contact with anther-thecae, mostly distinctly 2–5-lobed at apex. Disk depressed, glabrous. Fruit mostly globose or asymmetrical and compressed if only 1–2 pyrenes developed, ± 1 cm. diameter, with 1–5 pyrenes; pyrenes narrowly ± reniform or boat-shaped, the notch about one-third from the apex, the dehiscence line on a ± marked keel, often pitted.
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Corolla obtuse, acute or conspicuously long-apiculate in bud; tube cylindrical, glabrous or pubescent outside, glabrous or hairy within for part or for most of the tube length, or corolla tube with a ring of deflexed hairs in the middle; lobes shorter than to longer than the tube, acute to very distinctly long apiculate, or with a filiform appendage.
Flowers axillary, solitary, or in 2–10(15)-flowered umbel-like cymes, mostly 5-merous, small, usually white, yellowish or greenish; peduncles and pedicels mostly well-developed; bracts and sometimes bracteoles present, small; sometimes inflorescence axes scarcely developed and flowers appearing fasciculate.
Leaves opposite, or occasionally in whorls of 3 particularly in some forms of R. celastroides, petiolate, often with domatia in axils of nerves beneath; stipules often ± persistent, connate at the base, oblong or triangular, villous within, ending in a mostly linear or subulate ± deciduous appendage.
Calyx tube ± subglobose; limb short, truncate or denticulate, distinctly lobed in a few species (mostly in distinctive subgenera), mostly persisting on the young fruit.
Pollen presenter coroniform, subglobose or occasionally cylindrical, sulcate beneath where in contact with anther cells, mostly distinctly 2–5-lobed at the apex.
Pyrenes narrowly ± reniform or boat-shaped, the notch usually about one third from the apex, the dehiscence line on a ± marked keel, often pitted.
Stamens slightly to distinctly exserted; anthers often mucronate to slightly appendaged, often papillate; filaments very short.
Fruit mostly globose, or asymmetrical and compressed if only 1–2 pyrenes developed, c. 10 mm in diameter, with 1–5 pyrenes.
Shrubs or small trees, occasionally somewhat scrambling; stems spiny in a few species, usually distinctly lenticellate.
Ovary mostly 3–5(6)-locular, but 2-locular in some species.
Style usually exserted, slightly swollen at the base.
Disk depressed, glabrous.
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Foliage retention deciduous
Sexuality hermaphrodite
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Hardiness (USDA) 9-12

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Images

Rytigynia unspecified picture

Distribution

Rytigynia world distribution map, present in Angola, Benin, Burkina Faso, Botswana, Central African Republic, Congo, Cabo Verde, Ethiopia, Gabon, Ghana, Guinea, Guinea-Bissau, Kenya, Liberia, Madagascar, Mali, Mozambique, Nigeria, Rwanda, Sudan, Senegal, Sierra Leone, Somalia, Chad, Togo, Tanzania, United Republic of, Uganda, Zambia, and Zimbabwe

Identifiers

LSID urn:lsid:ipni.org:names:35283-1
WFO ID wfo-4000033699
COL ID 8W38F
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Rytigynia

Lower taxons

Rytigynia bugoyensis Rytigynia ferruginea Rytigynia flavida Rytigynia griseovelutina Rytigynia macrura Rytigynia madagascariensis Rytigynia monantha Rytigynia pseudolongicaudata Rytigynia rubiginosa Rytigynia ruwenzoriensis Rytigynia senegalensis Rytigynia seyrigii Rytigynia squamata Rytigynia torrei Rytigynia uhligii Rytigynia umbellulata Rytigynia hirsutiflora Rytigynia humbertii Rytigynia adenodonta Rytigynia bagshawei Rytigynia bridsoniae Rytigynia canthioides Rytigynia caudatissima Rytigynia celastroides Rytigynia dubiosa Rytigynia gracilipetiolata Rytigynia kigeziensis Rytigynia kiwuensis Rytigynia lecomtei Rytigynia lewisii Rytigynia liberica Rytigynia longipedicellata Rytigynia mrimaensis Rytigynia mutabilis Rytigynia nigerica Rytigynia obscura Rytigynia orbicularis Rytigynia pergracilis Rytigynia verruculosa Rytigynia acuminatissima Rytigynia beniensis Rytigynia binata Rytigynia bomiliensis Rytigynia constricta Rytigynia eickii Rytigynia claviflora Rytigynia congesta Rytigynia demeusei Rytigynia dewevrei Rytigynia glabrifolia Rytigynia gossweileri Rytigynia ignobilis Rytigynia nodulosa Rytigynia pauciflora Rytigynia lichenoxenos Rytigynia subbiflora Rytigynia neglecta Rytigynia rhamnoides Rytigynia membranacea Rytigynia dichasialis Rytigynia decussata Rytigynia erythroxyloides Rytigynia syringifolia Rytigynia pawekiae Rytigynia sambavensis Rytigynia setosa Rytigynia stolzii Rytigynia mayumbensis Rytigynia parvifolia Rytigynia pubescens Rytigynia rubra Rytigynia saliensis Rytigynia xanthotricha Rytigynia claessensii Rytigynia dasyothamnus Rytigynia krauseana Rytigynia longicaudata Rytigynia longituba Rytigynia macrostipulata Rytigynia argentea Rytigynia laurentii Rytigynia leonensis