Guioa myriadenia

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Guioa myriadenia


Shrub to tree, 2-9 m high, dbh up to 6 cm; Branchlets golden (sericeous to) hirsute, especially when young; Leaves 2-5-jugate; Inflorescences axillary to pseudo-terminal, branching basally and along the flattened, densely golden (sericeous to) hirsute, 1.7-15.7 cm long axis; Flowers 3.5-4 mm in diaim., not fragrant. Sepals 5, ovate, margin and outside pilose, margin with glands, inside glabrous, whitish; Petals 5, obovate, 2.5-4 by 1.3-1.7 mill, white to red; Stamens 8; Fruits with 1-3 well developed lobes, 1. -1.4 by 1.1-1.8 cm, smooth, glabrous, blackish when dry; Seeds obovoid, c. 6.2 by 4.8 mm;


Asia-Tropical: Philippines (Philippines present), Luzon present
Malesia: Philippines (Luzon).


1. This species can be distinguished by its ovate leaflets, reticulate venation, lower surface with sericeous to hirsute hairs, usually many pockets, punctation, sepals that are sericeous outside, and petals with a long claw, orbicular blade, and stipitate, clavate crests. Several forms are present, three of which are rather distinct. One form with leaflets with a sericeous lower surface occurs in the Benguet and Mountain Provinces. This form may be subdivided, some specimens have rather symmetrical leaflets, viz. G. myriadenia s.s., others have more falcate leaflets, viz. 'G.falcata'. The second form, with hirsute indumentum, occurs in Rual Province. Transitions between the two prevent the recognition of different species. The third form was known as G. obtusa (Tayabas Province) ancil has leaflets with a densely sericeous lower surface and obtuse apex. Only in the shorter apex it differs from the northern sericeous form with which it has a disjunct distribution (i.e. Benguet and Mountain Prov. are north and Tayabas south of Rizal).
2. Some specimens of G. myriadenia look re-ma rkably like the ‘G. lasiothyrs’ form of G. pleurapteris. Guioa myriadenia has always a rather golden indumentum, not dull brown like G. pleurapteris, while the venation is denser and usually m(ire distinct. The crest is also different, that of G. pit uropteris, if present, is part of a flat bifid scale apex, while that of G. myriadenia is clavate. The fruits of G. pleuropteris can be reddish when dry, those of G. myriadenia are black.


Radlk. 1914 – In: Philipp. J. Sc., Bot.: 446
Welzen 1989: p. 240. – In: Leiden Bot. Series: f. 98
Radlk. 1933 – In: Engl., Pflanzenr. 98: 1170
Radlk. 1933 – In: Engl, Pflanzenr. 98: 1168
Radlk. 1933 – In: Engl., Pflanzenr. 98: 1167
Merr. 1923 – In: Enum. Philipp. Flow. Pl.: 508
Merr. 1923 – In: Enum. Philipp. Flow. Pl.: 507
Merr. 1923 – In: Enum. Philipp. Flow. Pl.: 508