Canarium pallidum Daly, Raharim. & Federman, 2015

Daly, Douglas C., Raharimampionona, Jeannie & Federman, Sarah, 2015, A revision of Canarium L. (Burseraceae) in Madagascar, Adansonia 37 (2), pp. 277-345 : 330

Canarium pallidum Daly, Raharim. & Federman , sp. nov.

( Figs 1; 25 )

Small trees, leaves 1-2-jugate, stipules c. 3 mm long, leaflets glabrous, the apex gradually and broadly acuminate, the base symmetric, secondary veins in 7-10 pairs and the spacing decreasing toward apex and base, perpendicular epimedial tertiary veins present; distinguished from C. subtilis Daly, Raharim. & Federman , sp. nov. by the petiole 2.5- 3.5 (vs 1.8-2) mm long, stipules ovate (vs subulate in C. subtilis , sp. nov.), terminal leaflet larger than the laterals, on adaxial surface the secondary and higher-order veins narrowly prominent (vs impressed), leaflets drying whitish-green above (vs dark brown), and inflorescence axes subglabrous with elongate lenticels (vs with sparse ascending golden hairs to 0.35 mm long, not lenticellate).

TYPUS. — Madagascar. Antsiranana, Vallée de la Lokoho (Nord- Est), near Ambalavonio , [14°34’S, 49°44’E according to the botanical gazetteer of Madagascar (http://www.mobot.org/mobot/ gazetteer/)], 75-300 m elev., 9-10.I.1949 (buds), H. Humbert & G. Cours 22829 (holo-, P[P05311925]!) .

DISTRIBUTION AND ECOLOGY. — A small tree known only from the type, in moist forest. Buds in Jan .

ETYMOLOGY. — The specific epithet refers to the pale color of the dry leaflets.

DESCRIPTION

Trees, reproductive height to 6 m. Leaves 13.5-16.5 (21) cm long, 1-2-jugate; petiole 2.5-3.5 cm long, petiole and rachis glabrous; stipules 10-14 mm from petiole insertion, c. 3 mm long, ovate, constricted at base, glabrous, the scar 1-1.2 mm long; all lateral petiolules 4-10 mm long, terminal one 2-3.5 mm long; basal leaflets 2.8-4.3 × 1.1- 2 cm, ovate, other laterals 4.7-6.3 × 1.6-3 cm, elliptic to narrowly ovate, terminal one 6.4-8 × 2.8-4.5 cm, obovate to elliptic; apex gradually and broadly long-acuminate, the acumen 4-10 mm long; leaflet base symmetrical, acute; margin flat; leaflets chartaceous, drying whitish green above, dull, glabrous on both sides; secondary vein framework festooned-brochidodromous, secondaries in 7-10 pairs, spreading or sometimes almost straight, spacing somewhat irregular but decreasing toward apex and base, angle acute, slightly increasing toward base, perpendicular epimedial tertiaries present, intercostal tertiaries irregularreticulate with some alternate-percurrent, quaternaries regular-polygonal; on abaxial side the midvein broadly prominulous, rest of vein orders narrowly prominent, on adaxial side the midvein narrowly prominulous, rest of vein orders narrowly prominent; flower pedicel 2-3 mm long, cylindrical. Inflorescences 5-9 cm long, secondary axes poorly developed, axes with a few scattered thick, appressed, white hairs to 0.1 mm long, also with lenticels (scattered large, flat, elongate, whitish); bracts c. 1 mm long, subulate, bracteoles 0.2-0.4 mm long, linear, with a few hairs on margin; pedicel 2-3 mm long, cylindrical. In staminate buds the calyx c. 2.3 × 1.8 mm overall, cupular, the lobes c. 0.4 mm long, broadly rounded-deltate, glabrous; petals glabrous; stamens 3, the anthers 1.15-2 mm long, lanceolate in dorsiventral view, oblong in lateral view; ovariodisk 0.55-0.7 × 0.6 mm, subcylindrical (slightly obovoid). Open flowers and fruits unknown.

NOTES

Like C. subtilis , sp. nov., C. pallidum , sp. nov. has 1-2-jugate leaves, stipules c. 3 mm long, the leaflet apex gradually and broadly acuminate and the base symmetric, the secondary veins in 6-10 pairs, the spacing decreasing toward apex and base, perpendicular epimedial tertiaries present, on the abaxial surface the secondary and higher order veins narrowly prominent, and the leaflet surfaces (sub)glabrous. The latter can be distinguished by the petiole 2.5-3.5 (vs 1.8-2 in C. subtilis , sp. nov.) mm long, the stipules ovate and glabrous, the stipular scars relatively flat (vs stipules subulate and the scars elevated and swollen), the terminal leaflet larger than the laterals, on the adaxial surface the secondary and higher-order veins narrowly prominent (vs impressed), the leaflets drying whitish-green above (vs dark brown), the inflorescence axes subglabrous and with elongate lenticels (vs with sparse ascending golden hairs to 0.35 mm long and not lenticellate).

Figures

FIG. 25. — Canarium pallidum Daly, Raharim. & Federman, sp. nov.: A, branchlet with buds, with detail of leaflet (A’); B, detail of inflorescence with buds; C, basal portion of petiole showing stipular scar and insertion on branchlet;A-C, Humbert & Cours 22829[P05311925]. Scale bars:A,2 cm; B,2 mm;C,5 mm; A’,not to scale.