LEMNAUEAJ. 
405 
gated usually by budding and almost destitute of vascular tissue. 
Distrib. Cosmopolitan. Species 10-12. 
1. LEMNA, Linn. 
Flowers with a spathe produced from a cleft at the edge of the 
frond, which possesses a capillary root. Anthers 2-celled. Ovule 
solitary > semi-anatropous. Seed horizontal, with copious albumen. 
Distrib. Cosmopolitan. Species 5-6. 
1. L. minor, Linn. ; KuntJi , JEnum. iii. 4. Fronds obovate or 
oblong, thin, green, or tinged with purple, -fa— in. long, with a single 
long capillary root, the young ones sessile on the edges of the old. 
Spathe marginal, 2-lipped, containing one female and two male flowers, 
which expand one after the other. Style distinct. L. obcordata, 
JBojer, Sort. Maur. 358, not Vahl. 
Mauritius, frequent in ponds and swamps. Cosmopolitan. Yahl’s plant is a 
Riccia. Goemon , or Lenticule. 
Order CVI. CYPERACE^l. 
Flowers hermaphrodite or unisexual, each placed in the axis of a 
single small imbricating bract (glume). Perianth usually 0; if present, 
composed of hypogynous bristles or scales. Stamens 1-6, usually 3, 
hypogynous ; filaments filiform ; anthers 2-celled, basifixed, pendu- 
lous, dehiscing longitudinally. Ovary 1-celled ; ovule solitary, erect, 
anatropous ; style 1 ; stigmas 2-3, subulate. Fruit a minute hard 
lenticular or triquetrous acbene, in Garex enclosed in a bottle-like 
sac (perigyne). Seed with abundant farinaceous albumen, at or near 
the outside of which at the base the minute embryo is placed. — Herbs 
of various habit, with grass-like leaves, clasping the often triquetrous 
stem by a closed sheath. Grlumes distichous or multifarious, several 
forming a spikelet, nearly all or only one or two fertile. Distrib. 
Cosmopolitan. Species 2000. 
Tribe I. Cypere.®. G-lumes distichous. Flowers all hermaphro- 
dite. Achene naked. 
Glumes completely distichous. 
Flowers many in a spikelet 1 . Cyperus. 
Flowers few in a spikelet. 
Inflorescence a sessile head .2. Kyllinga. 
Infloresence an umbel of spikelets 3. Mariscus. 
Glumes incompletely distichous. 
Rachis twisted as it matures 4. Abilgaardia. 
Rachis straight. 
Hypogynous bristles 0 5. Arthrostylis. 
Hypogynous bristles present 6. Asterochcete. 
