Miliusa

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 : 10-11

Key to the Austro-Malesian species of Miliusa

Notes

In some couplets differences are small, therefore when there is any ambiguity, it is advised to consult the descriptions of relevant species.

1. Inner petals with crescent-shaped to semicircular glandular structures inside, at base or covering almost the whole basal half.................................................................................................................2

– Inner petals without pronounced glandular structures inside or with narrow glandular structures running inside along their bilateral midline……………............……………………………………3

2. Leaves 4.7–11.1 × 2.2–4.5 cm, base (broadly) cuneate, sometimes only slightly unequal, not clasping the twigs. Inner petals with dense hairs inside on the apical half; glandular structures inside between crescent-shaped and semicircular, located on almost the whole basal half. BUTON ISLAND (INDONESIA)…………..................…… Miliusa butonensis sp. nov.

– Leaves 9.3–26.0 × 4.0–11.0 cm, base (sub-)cordate, always (moderately to notably) unequal, ± clasping the twigs. Inner petals glabrous inside; glandular structures inside ± crescent-shaped, located at base. THAILAND, PENINSULAR MALAYSIA............................................................... …..................................................................................… Miliusa amplexicaulis Ridl. ( Ridley 1910)

3. Inner petals reFexed at anthesis, stamens Ż 125 per Fower. BORNEO......................................... ............................................................................................. Miliusa macropoda Miq. ( Miquel 1865)

– Inner petals not reFexed at anthesis but sometimes the apex/apical half recurved at anthesis, stamens Ľ 65 per Fower.............................……….............................................…………………….4

4. Stamens Ľ 9 per Fower………................…..............................……………………………………..5

– Stamens Ż 18 per Fower……….......................................……………..…………………………….6

5. Sepals and outer petals Ż 2.0 mm long, staminodes 4–5 per Fower, carpels 12–14 per Fower. AUSTRALIA …………..........................…………..………… Miliusa traceyi Jessup (Jessup 1988)

– Sepals and outer petals Ľ 1.5 mm long, staminode(s) up to 3 per Fower, carpels 3–11 per Fower. NEW GUINEA ….....................… Miliusa novoguineensis Mols & Kessler ( Mols & Keßler 2003b)

6. Ovules Ż 3 per ovary, biseriate……….......................................…………………………………….7

– Ovules 2(–3) per ovary, uniseriate…....................................…….…….…………………………..11

7. Inner petals without pronounced glandular structures inside. ANDAMAN AND NICOBAR ISLANDS ( INDIA), THAILAND, PENINSULAR MALAYSIA, SUMATRA ................................… ……………..........................……………...........................… Miliusa parviFora Ridl. ( Ridley 1911)

– Inner petals with narrow glandular structures running inside along their bilateral midline.............8

8. Inner petals 17.0–40.0 mm long. CHINA, LAOS, THAILAND, MYANMAR, ANDAMAN AND NICOBAR ISLANDS ( INDIA), PENINSULAR MALAYSIA, SOUTHEAST ASIAN ISLANDS (INCLUDING NEW GUINEA), AUSTRALIA................................................................................... ....................... Miliusa horsfieldii (Benn.) Baill. ex Pierre (Pierre 1881 ; basionym: Bennett 1840)

– Inner petals Ľ 15.0 mm long...............................................................................................................9

9. Carpels 21–27 per Fower, ovules 5–7 per ovary. AUSTRALIA........................................................ .......................................... Miliusa brahei (F.Muell.) Jessup (Jessup 1986 ; basionym: Mueller 1874)

– Carpels Ľ 18 per Fower, ovules Ż 8 per ovary...................................................................................10

10. Leaf base usually equal. Pedicels 0.9–2.5(–4.5) cm long. Monocarps (1.3–)2.0– 3.2 cm wide, stipe (11.0–)16.0–29.0 mm long, seeds 1.1–1.7 × 0.7–1.5 cm. NEW GUINEA....................................... ............................ Miliusa koolsii (Kosterm.) J. Sinclair (Sinclair 1955 ; basionym: Kostermans 1952)

– Leaf base unequal. Pedicels 2.9–14.5(–21.5) cm long. Monocarps 0.6–1.3 cm wide, stipe (4.0–) 10.0–16.0(–32.0) mm long, seeds 0.6–0.8 × 0.3–0.5 cm. THE PHILIPPINES..................................... ............................................................................................... Miliusa vidalii J. Sinclair (Sinclair 1955)

11. Flowers and/or inForesences axillary, inner petals usually tightly appressed from the base to ± the midpoint at anthesis. THAILAND, PENINSULAR MALAYSIA, SUMATRA, JAVA ........................ ...................................................................................................... Miliusa longipes King (King 1892)

– Flowers and/or inForescences terminal developing to internodal, inner petals completely open at anthesis.............................................................................................................................................12

12. Young twigs with dense hairs (visible by naked eye). Leaves narrowly ovate, lower surface of midrib with dense hairs. Stamens ca. 32 per Fower, carpels ca. 14 per Fower. D’ENTRECASTEAUX ISLANDS AND LOUISIADE ARCHIPELAGO (PAPUA NEW GUINEA)............................. ............................................ Miliusa lanceolata Chaowasku & Kessler (Chaowasku & Keßler 2006)

– Young twigs (almost glabrous to) sparsely hairy (visible only under a binocular). Leaves usually (broadly) elliptic, lower surface of midrib almost glabrous. Stamens ca. 56 per Fower, carpels ca. 28 per Fower. PAPUA NEW GUINEA.......................................................... Miliusa viridiFora sp. nov.