Flora of Barro Colorado Island

Serjania trachygona

Radlk., Monogr. Serj. 327. 1875

S. deltoidea Radlk.

Tendriled liana; younger stems merely striate or ob­scurely 3-6-lobed, the older stems prominently         3-ribbed, each rib consisting of 2 small strands loosely attached to a much larger central core; sap milky; tendrils forked; stems, petioles, and rachises puberulent to hirsute. Leaves 2- or 3 (5)-pinnate in 4-6 sets; petioles ribbed; rachis narrowly winged; leaflets small, acute to acuminate, acute to attenuate at base, l-3 cm long, 0.7-2 cm wide, the terminal leaflet rhomboid, often trilobate, the lateral leaflets ovate-elliptic, crenate, sessile, glabrate to hirsute (especially on midrib); juvenile leaves usually with more leaflets than adults. Thyrses racemose and axillary or in terminal racemose panicles; flowers white, 2-3 mm long, short-pedicellate; petals ca 1.7 mm long, obovate, the anterior petals borne on the outer face of large glands, their scales with yellow, prominently bilobed crests, the appendages densely villous all over, united as a single unit, pendent to apex of glands, the lateral petals borne atop glands, their crests slender, entire, usually white; staminal cluster leaning away from the axis; filaments villous; ovary glabrous. Fruits ovate-cordate, 1.5-2 cm long, as broad as or broader than long, weakly viscid (at least on the cell when dried), the cells sparsely hirsute with raised veins, the wing glabrous or sparsely hirsute on inner margin, reddish at maturity. Croat 7867,13123.

Occasional, in the forest. Flowers in the early dry season (December to February). The fruits mature in the late dry season (February to April).

The species is variable throughout its range in size of flowers, leaflet shape, and degree of compounding of the leaves.

Panama, Peru, and Bolivia, and probably more wide­spread in South America. In Panama, known only from tropical moist forest in the Canal Zone, Colón, and Panama.

See Fig. 350.

Photos from STRI Digital Archive

  • Serjania trachygona immature-Infructescences
  • Serjania trachygona
  • Serjania trachygona