Miliusa viridiFora Chaowasku & Kessler, 2013

Tanawat Chaowasku & Paul J. A. Keßler, 2013, Phylogeny of Miliusa (Magnoliales: Annonaceae: Malmeoideae: Miliuseae), with descriptions of two new species from Malesia, European Journal of Taxonomy 54, pp. 1-21 : 8-10

Miliusa viridiFora Chaowasku & Kessler , sp. nov.

urn:lsid:ipni.org:names:77131156-1

Figs 4–5

Diagnosis

Miliusa viridiFora sp. nov. is most morphologically similar to the recently described M. lanceolata . The new species chieFy differs in having much sparser indumentum on young twigs and lower surface of the leaf midrib, usually (broadly) elliptic leaves (narrowly ovate in M. lanceolata ), and greater number of stamens (ca. 56 vs. ca. 32 in M. lanceolata ) and carpels (ca. 28 vs. ca. 14 in M. lanceolata ) per Fower.

Etymology

The epithet refers to the light green Fowers (probably also at anthesis).

Type

PAPUA NEW GUINEA: Central District , Port Moresby Subdistrict , on ridge below Boridi Village , Oct. 1973, Foreman & Vinas LAE 60222 [holo-: L; iso-: A, BRI, CANB, E], in Fower and fruit.

Description

Trees. Young twigs (almost glabrous to) appressed-puberulous. Petioles ca. 1.0 mm long, almost glabrous to appressed-puberulous. Leaves usually (broadly) elliptic, sometimes slightly ovate, 4.5–13.3 × 2.1–4.9 cm, base (broadly) cuneate to obtuse, often slightly unequal, apex acute to acuminate; lamina glabrous above, (glabrous to) appressed-puberulous below; midrib Fat to slightly sunken above, almost glabrous, raised below, almost glabrous; secondary veins 11–15 pairs, angle with midrib 48°–65°. Flowers usually in Ż 7-Fowered inForescences, terminal developing to internodal; peduncles 2.3–4.4 cm long, glabrous; rachis 2.3–4.5 cm long, glabrous; pedicels 5.0–13.0 cm long, glabrous, basal articulation usually observed; bracts of peduncles and inForescence axes triangular, number depending on the number of Fowers per inForescence; pedicel bract 1 for each Fower, triangular. Sepals (broadly) triangular, 0.6–0.7 × 0.7–0.8 mm, persistent in fruit; both sides glabrous, margin puberulous. Outer petals triangular, ca. 1.3 × 1.0 mm; both sides glabrous, margin puberulous. Inner petals ovate, 7.0–8.0 × 5.0–6.0 mm; both sides glabrous, margin puberulous; surface of the inner side somewhat raised on the basal half compared to the apical half; base slightly saccate. Torus shortly cylindrical. Stamens ca. 56, 1.0– 1.4 mm long. Carpels ca. 28, ca. 1.3 mm long; stigmas capitate-globose; ovaries almost glabrous; ovules 2, lateral, uniseriate. Monocarps 2–7, subglobose-ellipsoid to slightly irregular-shaped, 0.9–1.2 × 0.8–1.1 cm, slightly constricted between seeds when two seeds present in the monocarps; surface slightly verruculose, glabrous; apex not apiculate; stipe 10.0–17.0 mm long, glabrous, obliquely attached to the monocarps. Seed(s) 1–2, subglobose(-ellipsoid), 0.8 × 0.4–0.7 cm.

Distribution, habitat and phenology

Papua New Guinea (Central Province, Fig. 4 ), occurring in secondary forests; on ridges. Elevation : ca. 1220 m. Flowering and fruiting: October.

Field notes

A small tree. Leaves mid green. Flowers light green.

Figures

Fig. 4. Distribution of Miliusa butonensis sp. nov. (Flled square) and Miliusa viridiFora sp. nov. (Flled circle).

Fig. 5. Miliusa viridiFora sp. nov. a. Habit. b. Flowering twig. c. Flower bud. d. Flower with one inner petal, stamens, and carpels removed. e. Stamen, abaxial view. f. Stamen, side view. g. Carpel. h. Monocarp. (All from Foreman & Vinas LAE 60222). Drawn by E. Winkel.