Memecijlon.'] MELASTONACEAE. 501 



1-seeded. Seed large, testa crustaceous, cotyledons convolute, 

 foliaceous. 



Leaves petioled, acute at base, not cordate, rarely rounded : 



Flowers sessile or very shortly pedicellate, in fascicles on axillary 

 or lateral tubercles : % 



Leaves lanceolate, acuminate ; floAvers axillary : 



Leaves up to 10 in. long by 2'5 in. broad with prominent intra- 

 marginal nerves connected by about 10-16 prominent straight 

 nerves with the midrib; flower-fascicles about '5 in. broad, 

 pedicels very short with lanceolate bracteoles ; calyx-tube 



campanulate, disk rays prominent and raised 1. Heyneanum. 



Leaves up to 4 in. long by 1*25 in. broad, the 6-10 nerves and 

 intramarginal nerve faint ; flower-fascicles '2 in. broad, the 

 few flowers sessile, bracteoles ovate ; calyx-tube campanulate, 



disk-rays very faint 2. Lawsoni. 



Leaves elliptic-ovate, up to 3'5 in. long, T5 in. broad, shortly and 

 obtusely acute to acuminate at apex, narrowed at base, dull and 

 yellowish when dry, intramarginal nerve and about 6 branching 

 nerves often visible ; peduncles very short, fascicled, axillary and 

 lateral, flowers sessile in umbels, with ovate bracteoles and cam- 

 panulate calyx-tube, disk rays not apparent 3. Talbotianum. 



Leaves elliptic or elliptic-obovate, under 2 in. long, 1 in. broad, 



nerves not visible, petiole very short ; flowers axillary or lateral : 



Leaves green when dry ; branchlets very slender, pale ; tubercle 



small, flowers very shortly pedicellate with small bracteoles ; 



calyx above the ovary saucer-shaped, disk rays obscure 



4. Lushingtonii. 



Leaves yellowish when dry ; branchlets slender, nodose, rough , 

 ultimate often quadrangular ; tubercles small, flowers shortly 

 pedicellate with lanceolate bracteoles ; calyx above the ovary 



campanulate, disk rays obscure 5. flavescens. 



Flowers clearly pedicellate, in pedunculate cymes : 



Cymes branched, lateral, the ultimate branches umbellulate : 

 Leaves linear-lanceolate up to 3 in. long by '5 in. broad, obtuse 

 at apex, intramarginal nerve close to the margin, the nerves 

 ascending; calyx above the ovary saucer-shaped, the disk 



clearly but not thickly rayed 6. angustifolium. 



Leaves ovate or ovate -elliptic, under 2 in. long by '75 in. broad, 

 obtuse or emarginate at apex, dull above, yellowish when dry, 

 nerves not visible; calyx campanulate, the disk rays con- 

 spicuous, raised 7. umbellatum 



