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, thai 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 lias been made. 



KEY TO THE PHILIPPINE SPECIES OF GL0CI1 IIMON." 



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 10-12-celled 5. G. littorale 



Anthers 2-4, usually 3, never 5. (§ Hemiglochidion.) 

 Styles free. 



Styles narrowed upward 6. G. triarulrum 



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 sballowly cordate 8. G. latistylum 



Leaf-bases ncute 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. williamsii 

 Capsule slightly depressed, the styles forming an apical point. 



13. G. breynioides 



• G. reticulatum is not here included, as its female flowers and capsules are 

 unknown. 



