Descripcion
Arbustos subhojosos, espinosos, de hasta 1,5 m de alt. Hojas opuestas o subopuestas, decusadas, elípticas, de 0,4-1,5 cm, de margen entero. Dos meristemas seriales en las axilas foliares, que originan, el inferior, una inflorescencia o una ramificación, y el superior, una espina uninoda. Flores en cimas 1-3 (4)-floras, amarillentas, verde-rojizas en la base. Tubo floral urceolado-campanulado, exteriormente pubescente, de 3-4 mm. Dientes del cáliz reflexos. Pétalos cuculado-unguiculados. Disco cóncavo, 5- lobulado. Ovario súpero, 3-locular. Cápsula 3-coca de 5 mm, con dehiscencia elástica. [Shrubs 1-4 m. tall; branches decussate, terete, in at least 2 size-classes, the primaries elongate and arcuate, the secondaries 1-8 cm. long, 1-2 mm. thick, rigid and thorn-tipped, all olive-green to olive-brown and rather densely pubescent with yellowish straightish or crisped, spreading or somewhat retrorsely curved hairs 0.1-0.3 mm. long, occasionally the secondaries with shorter thorn-tipped tertiaries, each secondary and tertiary branch usually with only one leaf- or flower-bearing node near the middle, the young developing primaries with many such nodes. Leaves decussate (sometimes slightly offset, not perfectly opposite); blades obovate to ovate to ablong, 3-15 mm. long, 3-4 mm. wide, penninerved, with more or less dense pubescence of yellowish antrorse-appresed crisped hairs 0.1-0.2 mm. long; petioles more or less 1 mm. long, slender pubescent; stipules subulate, ca. 1 mm. long, pubescent, dark, caducous leaving a minute blackish gland-like structure at base of each side of the petiole. Flowers solitary or in few-flowered fascicles, bisexual, 5-merous, nodding on pedicels 1-2 mm. long (elongating to 2-5 mm. in fruit); floral cup 3-4 mm. long, the lower moiety (the part lined by the disk and destined by accrescence to become the fruit-pedestal) hemispheric, pale reddish green, the upper moiety slightly campanulate, whitish with vertical roseate stripes leading to the stamen-attachments, the inner surface smooth, the outer pubescent with whitish crisped more or less spreading hairs 0.2-0.3 mm. long; sepals deltoid, ca. 1.5 mm. long, whitish; petals ca. 1 mm. long with a short basal claw and an ovate hoodlike portion, whitish; stamens at first hooded by the petals, then exposed by petal-reflexing; filaments whitish; disk lining the lower moiety of the cup, thin or at rim slightly thickened at the reddish vertical stripes of the cup and between those stripes. Ovary 3-celled, free from the disk and from the cup, glabrous; style about equalling the sepals. Fruit a 3 parts at maturity separating from each other and from the pedestal and each splitting in a ventral-apical midline to release the seed.]
Distribucion y Habitat
Vive en Bolivia y en Argentina ha sido hallada solamente en la provincia de Jujuy (Dpto. Yavi), entre los 2500 y 3800 m.s.m.
Sinónimos
Kentrothamnus Kentrothamnus weddellianus (Miers) M.C. Johnst.
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Trevoa weddelliana Miers
Ann. Mag. Nat. Hist., ser. 3 5: 491. 1860
Discaria weddelliana (Miers) Escal.
Bol. Soc. Argent. Bot. 1: 223. 1946
Kentrothamnus foliosus (Rusby) Suess.
Repert. Spec. Nov. Regni Veg. 50: 327. 1941
Colletia foliosa Rusby
Mem. Torrey Bot. Club 3(3): 16. 1893
Colletia foliosa Rusby var. microphylla Kuntze
Revis. Gen. Pl. 3(2): 38. 1898
Kentrothamnus penninervius Suess. & Overkott
Repert. Spec. Nov. Regni Veg. 50: 327. 1941
Ejemplares de referencia
Colector | N° Colect. | Especie | Departamento | Provincia | Imagen |
---|---|---|---|---|---|
|
9024 | Cochabamba | |||
|
17649 | Yavi | Jujuy | ||
|
21450 | Yavi | Jujuy | ||
|
575 | Chuquisaca | |||
|
594 | Cornelio Saavedra | Potosí | ||
|
23643 | Jujuy | |||
|
20845 | Santa Catalina | Jujuy | ||
|
17203 | Yavi | Jujuy | ||
|
17214 | Yavi | Jujuy | ||
|
23650 | Jujuy | |||
|
252 | Yavi | Jujuy | ||
|
11417 | Yavi | Jujuy | ||
|
11230 | Yavi | Jujuy | ||
|
435 | Sud Chichas | Potosí | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
607 | Yavi | Jujuy | ||
|
13083 | Yavi | Jujuy | ||
|
13083 | Yavi | Jujuy | ||
|
13083 | Yavi | Jujuy | ||
|
13083 | Yavi | Jujuy | ||
|
13083 | Yavi | Jujuy | ||
|
13083 | Yavi | Jujuy | ||
|
13083 | Yavi | Jujuy | ||
|
15886 | Yavi | Jujuy | ||
|
15886 | Yavi | Jujuy | ||
|
15886 | Yavi | Jujuy | ||
|
15886 | Yavi | Jujuy |
Nombre Vulgar y Usos
Tipo y Observaciones
Material Tipo: Basónimo: Trevoa weddelliana Miers
Observaciones: [The description is given above, since the genus is considered to be monotypic. Suessenguth and Overkott (loc. cit., and in Natürlichen Pflanzenfamilien ed. 2 20d: 164, 165. 1953) attempted to distinguish two species, mainly on the basis of the placement of slightly swollen portions of the upper margin of the nectaril disk (below the centers of the sepals in K. penninervius, below the stamens in K. foliosus). Examination of considerably more material than was available to those authors indicates the presence of the level of variation one expects in Rhamnaceae not only from plant to plant in a population, but from stage in anthesis in the same flower. Field observations are necessary to establish the exact sites and sequences fo swelling and nectar production in the disk at anthesis.]
Fruto