Flora of Romonum Island — Stone 
101 
5. Sori round; lobes of pinnae acute Cyclosorus 
4. Fronds bi- or tripinnate, deltoid in outline Davallia 
II. Flowering plants 
1. Monocotyledons (seed with 1 cotyledon; leaves usually with parallel venation; root system fibrous or without a tap- 
root; woody species with numerous discrete fibres traversing a softer tissue; flower parts frequently in 3’s or multiples 
of 3) 
2. Trees or large woody shrubs 
3. Palms; trunks large, unbranched, erect, or in Nypa submerged, + horizontal, with terminal crown of large 
pinnate leaves 
4. Stems horizontal, submerged in swamps Nypa 
4. Stems erect 
5. Fruits ovoid, smooth, large (to 12 inches diameter or more), edible (coconuts) Cocos nucifera 
5. Fruits smaller, subglobose, covered closely by glossy brown overlapping scales, inedible .... Metroxylon 
3. Trunks branching, leaves not divided 
6. Leaves elongate, toothed; fruit a large head; trunks usually with basal proproots Pandanus 
6. Leaves not toothed; fruit a small berry; trunks without proproots Cordyline 
2. Herbs, vines, or creepers; including grasslike plants (these sometimes with tall, moderately rigid, canelike stems) 
7. Plants strictly aquatic, submerged or floating 
8. In salt water only; marine plants rooted in sand or sandy debris in quiet lagoon waters 
9. Leaves up to 3 ft long or more, mostly 12-17 mm wide; rooted portion with black persistent fibres 
Enhalus 
9. Leaves seldom as much as 1 ft long, 4-10 mm wide; rooted portion lacking black fibres .... Thalassia 
8. In fresh water only, floating or loosely rooting in mud Blyxa octandra 
7. Plants terrestrial, rooted in soil 
10. Grasses and grasslike plants (grasses, sedges, reeds), i.e., usually with sublinear leaves with parallel veins, 
but leaves sometimes reduced or absent; small green or brown flowers; tufts of fibrous roots 
11. Stems triangular in cross section; inflorescence surrounded by leaflike bracts 
12. Inflorescence a buttonlike head Cyperus kyllingia 
12. Inflorescence with evident branching 
13. Coarse plants to 5 ft tall Cyperus odor at us 
13. Slender herbs to 2-3 ft Cyperus javanicus 
11. Stems round or nearly so in cross section; inflorescence without or with rather inconspicuous bracts 
14. Stems solid; rosette plants 
15. Leafy plants with branched inflorescences 
16. Seeds brown Eimbristyl'ts 
16. Seeds white Scleria 
15. Leafless plants w r ith apical inflorescence on scapes Eleocharis 
14. Stems hollow, nodose; rosette or creeping plants 
17. Tall (to 9-12 ft) with canelike stems, large plumose inflorescences of minute slender spikelets 
18. Inflorescence green or brown; swamp reeds Trichoon karka 
18. Inflorescence white or silvery (sugarcane of gardens) Saccharum officinarum 
17. Not tall reeds 
19- Fruit a spiny burr Cenchrus echinatus 
19. Fruit not a spiny burr 
20. Inflorescence narrow cylindric, breaking at joints when mature Lepturus repens 
20. Inflorescence not jointed and disarticulating 
21. Spikes digitate, 2 or more borne umbellately 
22. Spikelets awned 
23. Spikes 3-5; spikelets of several florets each, in several rows on lower side of 
rachis Dactyloctenium 
23. Spikes usually 2; spikelets paired, 1 stalked, 1 sessile Ischaemum 
22. Spikelets not awned 
24. Spikelets each with 1 floret 
25. Spikes 2, conjugate; fruit indurate, broader or broad as long . . Paspalum 
25. Spikes usually 3 or more; fruit cartilaginous; longer than broad Digitaria 
24. Spikelets each with several florets Eleusine indica 
21. Spikes not digitate 
26. Spikelets all on one side of rachis 
27. Spikes several, distant; grass of shady forest Oplismenus 
27. Spikes 1 or 2, close, hidden; beach grass Thuarea 
26. Spikelets on both sides of rachis 
28. Leaves elliptic, 1/^-1 inch wide; panicle large, pale, complex 
Centotheca lappacea 
28. Leaves narrow, less than *4 inch wide 
29. Spikelets minute, in a diffuse compound panicle; no awns .... Eragrostis 
29. Spikelets in a stiff reddish few-branched panicle; awns present Chrysopogon 
10. Not grasses or grasslike plants; herbs, often very large or giant, as in bananas; or vines 
30. Leaves with reticulate (network) venation 
