Tridentea

Tridentea
	Tridentea gemmiflora
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Gentianales
Family:	Apocynaceae
Subfamily:	Asclepiadoideae
Tribe:	Ceropegieae
Genus:	Tridentea; Haw.

Tridentea is a genus of succulent plant in the family Apocynaceae, endemic to southern Africa.^[1]^[2]^[3]

Name and history

Tridentea was first described as a genus in 1812, and its name refers to the three "teeth" on each interstaminal segment of its flower ("tri-" = three; "dentis" = teeth). It was subsequently split, and the genus Tromotriche was created for the ten species which were separated.

Description

Vegetative features

Tridentea stems are typically smooth, soft and appear as roughly four-edged in cross section. The four angles are marked by rows of low tubercle mounds. In young growth, each tubercle bears a small splayed leaf-remnant. These fall off with time though. Each leaf remnant is always surrounded by several minute, fat hairs.

Floral features

Tridentea flowers are flattened, star-shaped, and usually brightly coloured. The most common colouring is a mixed mottling of greenish-yellow with purple. Their inside is usually densely papillate. Flowers appear on minute inflorescences, and each stem bears only one inflorescence, from the stem base.

Species^[4]

Tridentea aperta (Masson) L.C. Leach - southern Africa
Tridentea choanantha (Lavranos & Harry Hall) L.C. Leach - southern Africa
Tridentea dwequensis (C.A. Lückh.) L.C. Leach - southern Africa
Tridentea gemmiflora (Masson) Haw. - southern Africa
Tridentea herrei (Nel) L.C. Leach - southern Africa
Tridentea jucunda (N.E. Br.) L.C. Leach - southern Africa
Tridentea longii (C.A. Lückh.) L.C. Leach - southern Africa
Tridentea longipes (C.A. Lückh.) L.C. Leach - southern Africa
Tridentea marientalensis (Nel) L.C. Leach - southern Africa
Tridentea pachyrrhiza (Dinter) L.C.Leach - southern Africa
Tridentea parvipuncta (N.E. Br.) L.C. Leach - southern Africa
Tridentea peculiaris (C.A. Lückh.) L.C. Leach - southern Africa
Tridentea pedunculata (Masson) L.C. Leach - southern Africa
Tridentea ruschiana (Dinter) L.C. Leach - southern Africa
Tridentea umdausensis (Nel) L.C. Leach - southern Africa
Tridentea virescens (N.E. Br.) L.C. Leach

formerly included

Tridentea baylissii, syn of Tromotriche baylissii

References

^ Tropicos
^ Gibbs Russell, G. E., W. G. M. Welman, E. Retief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. Van Wyk & A. Nicholas. 1987. List of species of southern African plants. Memoirs of the Botanical Survey of South Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).
^ Leach, Leslie Charles. 1978. Transactions of the Rhodesia Scientific Association 59(1): 3-5
^ The Plant List, Tridentea

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[1] Tropicos

[2] Gibbs Russell, G. E., W. G. M. Welman, E. Retief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. Van Wyk & A. Nicholas. 1987. List of species of southern African plants. Memoirs of the Botanical Survey of South Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).

[3] Leach, Leslie Charles. 1978. Transactions of the Rhodesia Scientific Association 59(1): 3-5

[4] The Plant List, Tridentea

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Tridentea

Tridentea gemmiflora
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Gentianales
Family:	Apocynaceae
Subfamily:	Asclepiadoideae
Tribe:	Ceropegieae
Genus:	Tridentea Haw.