Notoleptopus decaisnei (Benth.) Voronts. & Petra Hoffm.

Martin, B. de Manuel & Welzen, P. C. van, 2022, Revision of the genera Leptopus and Notoleptopus (Phyllanthaceae) in Malesia, Blumea 67 (1), pp. 20-25 : 23-24

1. Notoleptopus decaisnei (Benth.) Voronts. & Petra Hoffm. — Fig. 2

Notoleptopus decaisnei (Benth.) Voronts. & Petra Hoffm. (2008) 53, f. 6. — Andrachne decaisnei Benth. (1873) 88; Backer & Bakh.f. (1963) 470. — Arachne decaisnei (Benth.) Pojark. (1940) 342. — Leptopus decaisnei (Benth.) Pojark.(1960) 271; Airy Shaw (1980a) 123,(1980b) 645,(1982) 26. — Leptopus decaisnei (Benth.) Pojark. var. decaisnei : Airy Shaw (1980b) 645.— Lectotype (designated here): Bowman s.n. (lecto K [K000186432]*), Australia, Queensland, near Peak Downs.

Andrachne decaisnei Benth. var. orbicularis Benth.(1873) 88. — Andrachne fruticosa Decne.ex Müll.Arg var. orbicularis (Benth.) Pax & K.Hoffm. (1922) 173. — Andrachne orbicularis (Benth.) Domin (1927) 315. — Arachne orbicularis (Benth.) Pojark. (1940) 342. — Leptopus orbicularis (Benth.) Pojark. (1960) 272.— Leptopus decaisnei (Benth.) Pojark. var. orbicularis (Benth.) Airy Shaw (1978) 379,(1980a) 123,(1980b) 646.― Type: C. Harper s.n. (holo K [K000186433]*), W Australia, Port Walcot.

[ Leptopus dominianus Pojark. (1960) 511 (index), nom. nud.]

Andrachne fruticosa Decne. ex Müll.Arg. (1866) 235, nom. illeg., non L. — Arachne fruticosa (Decne. ex Müll.Arg.) Hurus. (1954) 339. — Syntypes: Anonymous s.n. (ex Herb. P) (G-DC*, 2 sheets), Indonesia, Timor; F. von Mueller s.n. (G-DC*), New Holland ( Australia), Victoria River; Zollinger 2795 (not seen), Indonesia, Java.

Subshrubs, 10‒50 cm high; internodes 0.5‒2 cm long; flower- ing branchlets 0.05‒0.3 mm diam, hairy, likely not glabrescent. Indumentum hirsute hairs of c. 0.8–1 mm long. Stipules triangular, 1‒2.5 by 0.25‒0.5 mm, membranous, apex attenuate, sometimes slightly acute, hairy. Leaves: petiole 0.25‒3 mm long, pubescent to densely pubescent; blade elliptic to obovate, 2.5‒50 by 2‒33 mm, 1‒2 times longer than wide, symmetric, base cuneate to slightly attenuate, margin flat to slightly sinuate, densely ciliate, apex attenuate to acute, adaxial surface puberulous to pubescent, abaxial surface densely pubescent, venation of 3‒5 lateral veins per side, midrib very prominent, flat on adaxial surface and elevated abaxially. Flowers: sepals ovate, with patent simple hairs, ciliate, apex acute to slightly rounded, midrib prominent; disc glabrous. Staminate flowers 0.4‒0.8 mm diam in bud, 0.9‒1.5 mm diam when open, coro- nate, light yellowish to reddish brown; pedicel terete, slightly thickened apically and basally, 0.8‒1.7 by 0.03‒0.12 mm, hairy; sepals ovate to elliptic, 0.6‒1 by 0.25‒0.5 mm; petals elliptic to obovate, 0.75‒1.1 by 0.1‒0.2 mm, glabrous to slightly pubescent, margin entire, apex acute to attenuate, midrib prominent; disc glands in Malesian material small and indistinct, bilobed; stamens: filaments 0.25‒0.5 mm long, glabrous, an- thers 0.15‒0.22 by 0.2‒0.25 mm, yellowish brown; pistillode 0.1‒0.2 mm long, subsessile. Pistillate flowers 1.5‒3 mm diam in bud, 2.5‒3.5 mm when open, disc-like, puberulous; pedicel terete, thickened especially apically, 1.5‒4.5(– 6.5 in fruit) mm long, pubescent to densely pubescent; sepals ovate, 2.2‒3(– 3.4 in fruit) by 1.2‒1.9(– 2.1 in fruit) mm; petals elliptic to ligulate to obovate, 0.35‒0.55 by 0.18‒0.3 mm, slightly pilose, margin en- tire, apex narrowly rounded, distinctly veined; disc lobes strap-like, c. 0.5 by 0.3 mm; ovary globose to slightly oblate, 0.5‒1 by 0.75‒1.3 mm, densely pubescent; stigmas 0.55‒0.8 mm long. Fruit triangular in transverse section, 1.5‒3.5 by 2.7‒4.5 mm, densely pubescent, reticulately veined; columella 1.2‒1.7 mm long. Seeds 1.35‒1.8 by 1‒1.3 by 0.75‒1 mm, black when dry.

Distribution — Malesia: Java (Madura), Lesser Sunda Islands (Roti, Sumba, Timor), Papua New Guinea (Central Province); Australia (Queensland).

Habitat & Ecology — Scarce to locally fairly common in usu- ally (more) open places in rocky surroundings between grass tussocks and in open Eucalypt woodland. The plants appear to be much cropped by wallabies (Pullen 9616). Altitude: 1‒ 500 m. Flowering and fruiting: February to May.

Note — A geocline may be present as staminate disc lobes and pistillode seem to be smaller on Madura (near Java) and much larger in Australia. However, the material was too scarce to be certain.

24 Blumea – Volume 67 / 1, 2022 Acknowledgements We thank Jan van Os (†) and Esmée Winkel for the two beautiful drawings and the director of Naturalis Biodiversity Center for facilities and use of the collections.The other herbaria mentioned are thanked for providing high resolution images of the types. The last author thanks the Treub Maatschappij (the Society for the Advancement of Research in the Tropics) for their support of the Ornstein chair in Tropical Plant Biogeogra- phy. Two reviewers are thanked for their helpful suggestions that improved this manuscript.