Arthrophyllum maingayi

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Arthrophyllum maingayi

Description

Low shrub or slender tree, rarely as high as 10 m, rufous-tomentose on the very young parts, soon becoming glabrous. Leaves tufted at the ends of the branches, usually with 5-7 leaflets (but up to 15), up to 30 by 18 cm; Inflorescence consisting of a number of primary branches radiating from the end of a leafy shoot (which forms a longer or shorter peduncle); Petals 5, l112-2 mm long in bud. Stamens 5. Ovary turbinate, disk fleshy. Fruit spheroidal, c. 8 by 6 mm, calyx and stylopodium rather inconspicuous.

Distribution

Asia-Tropical: Borneo present; Malaya (Peninsular Malaysia present), Central W. Sumatra present, Mt Kerintji present, Penang present
Malesia: Central W. Sumatra (Mt Kerintji), throughout the Malay Peninsula (incl. Penang) and Borneo.

Notes

The name 'A. pinnatum', misapplied by Clarke, l.c., has been in general use for this species. However, this name was based on Panax pinnatum Lamk, which in turn was based on the Rumphian name 'Scutellaria secunda'; this is quite a distinct plant (see under 6. Polyscias cumingiana).
The three species A. maingayi, 16. A. montanum and 17. A. alternifolium are similar in having simpler inflorescences than 9. A. diversifolium.
A. montanum can be distinguished from A. maingayi by its more leathery leaves with more prominent nervation, and by the more woody and leafy flower-bearing primary branches of the inflorescence.
A. alternifolium is distinguished from both these species by its small, coriaceous leaflets with inconspicuous nervation.
Most specimens can be readily distinguished, but a few can be assigned to a species only doubtfully, usually because the material is inadequate. This is usually due to the junction between the vegetative (spiral phyllotactic) shoots and the flower-bearing branches being omitted.

Citation

Seem. - in J. Bot. 1866: 294
Ridl. - in Fl. Mal. Pen. 1922: 886