Diagnostic description ³

Chromolaena borinquensis (Britton) H. Rob., Phytologia 20: 199. 1970.

Fig. 34. A-D

Basionym: Osmia borinquensis Britton

Synonym: Eupatorium borinquense (Britton) B.L. Rob.

Clambering shrub, slightly woody, much branched, 1.5-2.5 m in length. Stems cylindrical, glabrous, and smooth. Leaves opposite; blades 3-5 × 0.5-2 cm, chartaceous, deltate-lanceolate or narrowly lanceolate, 3-nerved from the base, the apex acuminate, the base cuneate or rounded, the margins with a marginal vein, revolute, remotely dentate-serrate; upper surface glabrous, with the venation sunken; lower surface glabrous, glandular-punctate; petioles 2-5 mm long, glabrous. Capitula numerous, arranged in corymbiform cymes; peduncles 1-2 cm long; involucre cylindrical, 0.5-1 cm high; phyllaries green, in 5 series, the outer much shorter than the inner, ovate, glabrous. Corollas pale violet, tubular, ca. 5 mm long, glabrous; anthers almost white, stigmatic branches pale violet. Achenes cuneiform, 3.5-4 mm long, triangular in cross section, glabrous, black, with the margins white; pappus of numerous white barbate setae, 3-3.5 mm long.

Phenology: Flowering and fruiting from November to April.

Status: Endemic to Puerto Rico, uncommon.

Selected Specimens Examined: Acevedo-Rdgz., P. 206; 7779; 9367; Britton, N.L. 8486; Proctor, G.R. 43021; 44475; Sargent, F.H. 3292.

Distribution ⁴

Distribution: On slopes of forests or thickets in the zone of mogotes.

Public forest: Río Abajo.

Sources and Credits

1. (c) Smithsonian Institution, National Museum of Natural History, Department of Botany, some rights reserved (CC BY-NC-SA), https://collections.nmnh.si.edu/services/media.php?env=botany&irn=10350745
2. (c) Smithsonian Institution, National Museum of Natural History, Department of Botany, some rights reserved (CC BY-NC-SA), https://collections.nmnh.si.edu/services/media.php?env=botany&irn=10350766
3. (c) Pedro Acevedo-Rodríguez, some rights reserved (CC BY-NC-SA), http://eol.org/data_objects/28435126
4. (c) Pedro Acevedo-Rodríguez, some rights reserved (CC BY-NC-SA), http://eol.org/data_objects/28435693

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