Rourea accrescens Forero

Authority

Forero, Enrique. 1976. A revision of the American species of Rourea subgenus Rourea (Conaraceae). Mem. New York Bot. Gard. 26 (1): 1-119.

Family

Connaraceae

Scientific Name

Rourea accrescens Forero

Description

Latin Diagnosis - Frutex scandens, ramulis teretibus puberulis. Folia imparipinnata, rare unifoliolata, cum petiolo 2-8 cm longo, glabro vel minute puberulo, rachi (l-)3-8 cm longa, glabra vel minute puberula, basim versus teretia foliola versus planiore. Foliola 8-18 cm longa, 3-7 cm lata, elliptica vel anguste elliptica, chartacea, supra opaca vel plus minusve nitida, glabra, subtus pallida, opaca vel plus minusve nitida, glabra; apice acuminata, basi cuneata vel rotundata, margine leviter revoluta, petiolulo 0.3-0.6 cm longo, venis impressis vel planis; nervis lateralibus 6-8 jugis ascendentibus, cum costa angulo 30°-50° facientibus, versus marginem anastomosantibus; venulis versus basim foliolorum transversis. Inflorescentiae paniculatae, axillares vel terminales, rachibus 2-9 cm longis, puberulis. Bracteae 0.1-0.2 cm longae, triangulares vel lineares. Pedicelli articulati, 0.1 cm longi vel flores sessiles; sepala 0.25-0.3 cm longa, 0.1-0.15 cm lata, ovata vel oblongo-ovata, extus dense puberula; pétala 0.4-0.5 cm longa, 0.1-0.15 cm lata, oblongo-elliptica, glabra, libera; stamina 10, 5 brevibus ca. 0.25 cm longis, 5 longioribus ca. 0.3 cm longis; tubo 0.5 mm longo; anthera globosa, 0.5 mm in diámetro; ovarium tomentosum, ca. 0.1 cm longum; stylus ca. 0.1 cm longus. Follicu-lus 1-1.1 cm longus, 0.5 cm latus, glabrus, sessilis vel cum pedúnculo 0.1 cm longo munitus, calyce (0.5-)0.7-0.9 cm longo toto accrescenti, dentibus 0.15-0.2 cm longis, margine ciliato vel glabro, apice barbato. Semen 0.8 cm longum; arilloidio 0.4-0.5 cm longo; testa sub arilloidio sculp to.

Species Description - Woody vine; branchlets terete, puberulous. Leaves imparipinnate 1-2-jugate, rarely unifoliolate; petiole 2-8 cm long, glabrous to minutely puberulous; rachis (l-)3-8 cm long, glabrous to minutely puberulous, terete at the base, flattening out in the areas of insertion of the distal pair of leaflets. Leaflet 8-18 cm long, 3-7 cm broad, elliptic or narrowly-elliptic, chartaceous, the upper surface opaque or somewhat shiny, glabrous, the lower surface pale, opaque or somewhat shiny, glabrous, the apex acuminate, the base cunéate or rounded, the margin slightly revolute; petiolule 0.3-0.6 cm long; venation impressed or plane; lateral veins 6-8 pairs, ascending, diverging from midrib at angles of 30°-50°, anastomosing diffusely near margin; veinlets transverse in lower half of leaflets. Inflorescence paniculate, axillary to terminal, the rachilla 2-9 cm long, puberulous; bracts 0.1-0.2 cm long, triangular or linear, densely puberulous. Pedicel articulate, 0.1 cm long or flowers sessile; sepals 0.25-0.3 cm long, 0.1-0.15 cm broad, ovate to oblong-ovate, densely puberulous without; petals 0.4-0.5 cm long, 0.1-0.15 cm broad, oblong-elliptic, glabrous, free; stamens 10, five short ca. 0.2 cm long, five long, ca. 0.3 cm long, the tube ca. 0.5 mm long; anthers globose, 0.5 mm in diam; ovary glabrescent, ca. 0.1 cm long; style ca. 0.1 cm long. Fruit glabrous, 1-1.1 cm long, 0.5 cm wide, sessile or peduncle 0.1 cm long; calyx in fruit completely accrescent, (0.5-)0.7-0.9 cm long, glabrous, the teeth 0.15-0.2 cm long, the margin ciliate or glabrous, the apex barbiculate. Seed 0.8 cm long; arilloid 0.4-0.5 cm long; testa under arilloid sculptured.

Discussion

Holotype (NY): Brazil, Acre, Cruzeiro do Sul, Rio Juruá, km 18 road Cruzeiro do Sul to Japiim. G. T. Prance, B. S. Pena & J. F. Ramos 2853 fr. Oct 1966. Isotype (INPA). This very distinct species from western and southwestern Amazonia can be readily recognized by its usually narrowly elliptic leaflets with impressed venation, but especially by the accrescent calyx in fruiting condition. The arilloid is very well developed, covering a little more than the lower half of the seed, and the testa under the arilloid is characteristically sculptured. Rourea accrescens is related to R. amazonica.

Distribution

Distribution. Known from Amazonian Perú and adjacent Brazil. Occurring in upland forest.

Peru South America| Brazil South America|