Miliusa butonensis 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 : 5-8

Miliusa butonensis Chaowasku & Kessler , sp. nov.

urn:lsid:ipni.org:names:77131155-1

Figs 3–4

Diagnosis

Miliusa butonensis sp. nov. belongs to clade C. It is best characterized by (1) dense hairs on the apical half inside the inner petals and (2) glandular structures that cover almost the whole basal half of the inner side of the inner petals.

Etymology

Named after the Buton Island ( Indonesia) where this species is endemic.

Type

INDONESIA: Southeast of Sulawesi, North Buton Is., Jismil camp inland from Labuan Tobelo , Nov. 1989, Coode 6279 [holo-: U; iso-: A, K, L], in fruit (with a few persistent inner petals).

Description

Trees, ca. 8 m tall, ca. 10 cm in diameter. Young twigs appressed-puberulous. Petioles 2.0–3.0 mm long, appressed-puberulous. Leaves elliptic to slightly ovate, 4.7–11.1 × 2.2–4.5 cm, base (broadly) cuneate, sometimes slightly unequal, apex acute; lamina glabrous both sides; midrib usually slightly raised to Fat above, sometimes slightly sunken, glabrous, raised below, appressed-puberulous; secondary veins 15–18 pairs, angle with midrib 42°–50°. Flowers partially known; fruiting peduncles or fruiting pedicels axillary; fruiting peduncles up to 0.4 cm long; fruiting pedicels 0.9–2.1 cm long; sepals and sometimes outer petals persistent in fruit, both ovate-triangular. Inner petals a few persistent ones fallen on herbarium sheet near the torus bearing monocarps seen, ovate-triangular, ca. 6.0 × 4.0 mm; outside appressed-puberulous, mostly on the middle part, margin puberulous, inside (curly-)velvety on the apical half; glandular structures observed on almost the whole basal half, slightly raised, between crescentshaped and semicircular, slightly Fnely warty; base not saccate. Monocarps 3–21, subglobose-ellipsoid, 0.7–0.9 × 0.6–0.8 cm; surface smooth, glabrous; apex not apiculate; stipe ca. 6.0 mm long, glabrous. Seed(s) 1 (rarely 2), subglobose(-ellipsoid), 0.6–0.8 × 0.4–0.7 cm.

Distribution, habitat and phenology

Indonesia (Buton Island, Fig. 4 ), occurring in forests on Fat ridge-tops, with slightly broken canopy due to rocky terrain of raised coralline limestone. Elevation: ca. 300 m. Fruiting: November.

Field notes

Branches horizontal and foliage in Fat sprays. Bark grey-brown, ca. 4 mm thick overall, ± smooth with Fne vertical cracks and rows of low lenticels, wood straw-colored, cut bark and wood pleasantly aromatic. Young leaves ± yellow-green, mature leaves mid green on both sides.

Figures

Fig. 3. Miliusa butonensis sp. nov. a. Habit. b. Outside (abaxial surface) of a persistent inner petal. c. Inside (adaxial surface) of a persistent inner petal. d. Fruit. (All from Coode 6279). Drawn by E. Winkel.

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