88 
ROBINSON. 
into sections, although based upon so variable a character as stamens 2-4, 
and stamens 4—6, seems to hold good. As elsewhere stated, no plant has 
been found with both 3-anthered and 5-anthered flowers, and no flowers 
have been found with 4 anthers except on plants which had also flowers 
with either 3 or 5. Further division is a matter of great difficulty, and 
is based upon the styles, the most natural character available. In use, its 
drawbacks are that by the growth of the ovary, the stylar column re- 
maining nearly unchanged or withering, the proportions become greatly 
changed ; further, that very slight differences at the apex make it subconic, 
cylindric, or clavate, changes not unlikely to be produced by pressure in 
drying or otherwise. It is difficult to resist the conviction that such 
species as G. album, G. tricliogynum, and G. latistylum, which have nearly 
as great a stylar variation as that of the genus, have nevertheless had a 
comparatively recent common ancestry. The entire series seems to show 
that it is emerging from a state of great instability, the species tending 
to differentiation by means of the styles, and from that standpoint the 
present attempt at classification has been made. 
KEY TO THE PHILIPPINE SPECIES OF GLOCHIDION . 6 
Anthers 4-G, usually 5, never 3. (§ Euglochidion.) 
Styles free, longer than the ovary 1. G. quinquestylum 
Styles often becoming free, shorter than the glabrous ovary.. 2. G. urophylloides 
Styles forming a definite column. 
Stylar column thicker above, ovary glabrous 3. G. lancifolium 
Stylar column not thicker above, ovary pubescent. 
Ovary 4- or 5-celled 4. G. angulatum 
Ovary I0-12-celled 5. G. littorale 
Anthers 2-4, usually 3, never 5. ( § Hemiglochidion. ) 
Styles free. 
Styles narrowed upward G. G. triandrum 
Styles slightly dilated upward 7. G. psidioides 
Styles forming a lobed or almost entire column. 
Stylar column as broad as ovary, strongly constricted at base. 
Leaf-bases shallowly cordate 8. G. latistylum 
Leaf-bases acute 9. G. coronulatum 
Stylar column at base as broad as ovary, not or only slightly constricted. 
(See also Nos. 19 and 26, if the flowers are very young.) 
Stylar column nearly same length as ovary. 
Stylar column wider at apex, deeply lobed. 
Ovary glabrous 10. G. llanosii 
Ovary densely pubescent 11. G. molle 
Stylar column narrowed above. 
Capsule greatly depressed, the styles forming an apical disk. 
12. G. xoilliamsii 
Capsule slightly depressed, the styles forming an apical point. 
13. G. breynioides 
6 G. reticulatum is not here included, as its female flowers and capsules are 
unknown. 
