34. Rhodostemonodaphne sordida

Rhodostemonodaphne sordida Madriñán, sp. nov.

Type. Peru. Loreto: Maynas, Iquitos, Quistococha, 28 Apr 1989 (stam. fl), R. Vásquez & N. Jaramillo 12066 (holotype, MO; isotype MO n.v.).

Rhodostemonodaphne morii nisi tepalis expansis et reflexis similis.

The epithet refers both the indument on all plant parts and to the color of the dried leaves, which together give the specimens a dirty appearance.  [Lat. sordidus, sordid].

Description

Trees: branches basitonic, in axils of cataphylls, pseudo-verticillate; twigs terete, 3 mm diam.; epidermis black; terminal bud plump, 4 X 3 mm; cataphylls caducous; indument puberulous to tomentose, caducous after one flush, the hairs dense to sparse, up to 1 mm long, straight to crisped, erect, yellowish to reddish. Leaves: petioles slender to robust, 0.5–1.2 cm X 2–3 mm, terete; blades chartaceous, flat, elliptic, 5–12 X 4–6 cm; base rounded to obtuse, 90–150°; apex rounded to acute, 60–100°, acuminate for up to 2.5 cm; margin plane; primary vein above raised, below prominent; secondary veins 4–6 pairs, equidistant, brochidodromous, above flat, below raised, diverging at 60°, evenly arching, chordal angle 30°, the angle uniform along blade length; tertiary veins above inconspicuous, below slightly raised, random-reticulate; higher order veins above inconspicuous, below slightly raised; surface above light to dark brown (mottled), below dark brown; indument above absent, the primary vein tomentose, below puberulous, the hairs sparse, up to 1 mm long, straight to curved, erect, yellowish-brown, denser on the veins, caducous after one flush. Staminate inflorescences: acrotonic, erect, peduncles 4–8 cm long, the hypopodia 1.5–5 cm X 1–1.5 mm, branch orders 6, the second-order branches 2–8, dispersed to clustered apically, lowest branch up to 0.6–2 cm long, color and indument of all axes as on twigs; bracts and bracteoles caducous (not seen). Staminate flowers: pedicels 1.2 X 0.4 mm, the diameter even throughout; receptacle obconical to flat, ca. 1 X 1.5 mm; tepals chartaceous, ovate, ca. 1 X 1.2 mm, at anthesis recurved, yellowish-brown, adaxially puberulous; stamens of whorls I and II capitate, the anthers oblong, ca. 0.8 X 0.5 mm, with a few hairs at base, the locelli 4, apical, in a strong arch, introrse, the glands absent; whorl III columnar, ca. 1.2 X 0.5 mm, with a few hairs at base, the locelli 4, the upper pair latrorse, the lower pair extrorse, the glands globose, ca. 0.6 mm diam.; whorl IV absent; all stamens reddish-brown; pistillode absent. Pistillate flowers and fruits unknown.

Field notes

Trees up to 15–18 m tall and 20 cm diam. Tepals green, maturing red.

Distribution (Figure 20)

Known from the vicinity of Iquitos in Peru and of Manaus in central Amazonia, at ca. 100 m elev., in non-inundated rain forest.  Flowers found in April and May.

Additional specimens examined

Brazil. Amazonas: Mun. Manaus, Ducke Forest Reserve, 18 May 1965 (stam. fl), Rodrigues 6938 (G, NY).

Discussion

Rhodostemonodaphne sordida is similar and possibly closely related to R. morii.  Both species have similar indument, leaf texture, venation, inflorescence position on the flush, and inflorescence morphology.  They differ, however, in the color of the indument of the leaves, that of R. sordida being yellowish brown, and especially in the shape of the flowers, those of R. morii being urceolate, with minute, erect tepals, while those of R. sordida have larger, spreading to reflexed tepals.  Rhodostemonodaphne sordida is found in western Amazonia, while R. morii is a species of the Guianas.

Contact | Updated 29.07.2005 | ©2005 Santiago Madriñán