Calyptranthera schatziana Klack., 2000

Klackenberg, Jens, 2000, Calyptranthera schatziana (Apocynaceae s. l., Secamoneae), a new species from Madagascar, Adansonia (3) 22 (1), pp. 33-37 : 34-36

Calyptranthera schatziana Klack. , sp. nov.

Species haec Calyptrantherae baronii et C. grandiflorae similis sed floribus minoribus (lobi calycis 1.7- 1.9 mm longi, lobi corollae 20 mm longi) et connectiviis prolongatis lobos coronae valde superantibus (lobi coronae parvuli, 0.8-0.9 mm longi) differt.

TYPUS. — Schatz & Bernard 3693, Madagascar, Antsiranana prov., Masoala Peninsula, 0.1 km SE of “Tamany Fred” watershed of the Anaovandrano River , 15°45’15’’S, 50°12’30’’E, 50 m alt., 17 Nov. 1996 (holo-, MO; iso-, P, S, TAN).

Suffrutescent twiner with milky latex, climbing to 5 m above ground, with younger branches densely covered by more or less bent reddish hairs, glabrescent. Leaves opposite, somewhat coriaceous, dark green above, light olive-green below with purple mid-rib, usually revolute at the very margin; blade 9-12 × 3.5-5 cm, elliptic to obovate, cuneate at the base, acuminate, pubescent with reddish bent hairs beneath particularily along the veins and margins, very sparsely so on lamina and totally glabrous above, without colleters at the very base above; margin even; venation pinnate and looped, reticulate; mid-rib when dry distinctly impressed above and raised beneath; primary veins divaricate to right-angled, slightly raised on both sides when dry; secondary veins grossly reticulate, ± even with the leaf surface; epidermis ± smooth on both sides; petiole distinct, 1-1.5 cm long, with dense reddish mostly appressed hairs. Inflorescences extra-axillar, about as long as to usually shorter than the adjacent leaves; cyme with few flowers in pairs near the apex with short internodes that elongate when older with distinct scars of earlier flowerpairs, rather sparsely covered by bent reddish hairs; pedicels slender, 2-3.5 cm long; bracts and bracteols narrow, 1.5-2 mm long. Flowers pentamerous, actinomorphic. Calyx lobes united only at the very base, 1.8-1.9 × 0.9-1.1 mm, longer than the corolla tube, triangular, acute, with a few reddish hairs outside, glabrous inside, with a small colleter at each lobe sinus. Corolla elliptic in bud, contorted with the left lobe margin overlying, not or only slightly twisted, with the lobes fused at the base only into a short tube, olive-green suffused with purple towards centre; tube 0.4-0.6 mm long, glabrous; lobes 17-21 × 5- 6 mm, narrowly elliptic, rounded at the apex, rotate and with the lobes slightly curved backwards, glabrous outside, glabrous inside except for a patch of straight erect white hairs near the base and with long distinct somewhat bulbous hairs in a submarginal ca. 1.3 mm long row at each side, with 5-7 parallel veins. Stamens in a column 11.5-12.5 mm high (including projecting connectives), inserted at the base of the corolla tube; filaments broad with short sclerified margins (anther wings) and with a cup-like projection below (pollinium entrance), united into a short but distinct cylinder at base; anthers (excluding connectives) 1.7-1.9 mm long, with hairy/papillate thecae; connectives much prolonged into five free filiform and somewhat clubshaped appendages, 10-10.5 mm long, hairy/ papillate, lavender. Corona lobes filiform, 0.8- 0.9 mm long, bent upwards, much shorter than the connectives, glabrous. Pollinaria each with 4 pollinia grouped close together; pollinia two in each anther locule, ascending, ellipsoidal, ca. 0.2 mm long, attached on U-folded soft corpuscula at the margin of a discoid style head. Ovary subinferior, with numerous ovules. Style narrow and cylindric at lower half but conical below the

B

style head, 1.1-1.3 mm high; style head 0.5- 0.6 mm high, with a discoid lower part abruptly narrowed into the style, and with a narrower and short upper part, which is slightly depressed at the apex, about as long as the thecae. Follicles not seen. — Fig. 1.

DISTRIBUTION AND HABITAT. — Calyptranthera schatziana is known only from the type locality at the Masoala Peninsula in the northeastern part of Madagascar. It was found in humid evergreen forest on laterite at 50 m altitude in flower in November. It differs from all other species of the genus by its well-developed thread-like and somewhat club-shaped prolonged connectives in combination with very small and erect cylindric corona lobes, which do not exceed the thecae.

Figures

Fig. 1. — Calyptranthera schatziana: A, habit; B, flower in bud; C, portion of corolla from within; D, gynostegium; E, gynostegium with one anther removed; F, anther seen in lateral view; G, pollinaria; H, style head. (Schatz & Bernard 3693; B-H from spirit material). Drawn by P. vON KNORRING.