288 CLYI. CYPERACEH (CLARKE). [Kyllinga. 
Var. Kelleri, C. B. Clarke. Spike and spikelets rather smaller. Nut-bearing 
glumes elliptic, subtriangular at the tip, not at all acuminate. 
Nile Land. Somaliland: Abdallah, Keller, 80! 87! 
2, PYCREUS, Beauv, Fl. Owar, ii. 48, t. 86, fig. 2. 
Spikes umbellate or solitary, or of only 1 spikelet. Spikelets 5-40- 
“flowered; glumes distichous, 2 lowest empty, several succeeding bi- 
-sexual and perfecting nuts, caducous in fruit from the lowest upwards ; 
vhachilla persistent, not winged. Stamens 3-1, anterior; anthers 
narrow-oblong, not crested. Style passing continuously into the top 
of the pistil, not bulbous at the base; branches 2, linear in a plane 
‘passing through the rhachilla. Nut ellipsoid or obovoid, compressed 
laterally.—Glabrous. Leaves all close to the base of the nodeless stem 
(in species 9-11 the stem is more clothed by leaf-sheaths in its lower 
half), green and long. Spikelets in ebracteolate (rarely bracteolate in 
P. albomarginatus) clusters or spikes arranged in bracteate umbels ; 
bracts similar to the leaves, only smaller.—Cyperus, Benth. et Hook. f. 
Gen. Pl. iii. 1043 partly, 
Species 63; in all tropical and warm-temperate regions, a few extending 
to Canada and Amurland. 
*ZONATH.—Superficial cells of the nut longitudinally oblong or elliptic. Nut 
- often appearing zonate or muricate by reason that the thickened ends of the cells run 
-into an undulating or broken horizontal line. 
Annuals, 
Spikelets yellow or reddish, hardly at all chest- 
nut-coloured. 
Spikelets yellowish, with parallel sides . 1. P. flavescens. 
Spikelets reddish-brown, lanceolate 5 . 2. P. intermedius. 
Spikelets yellow, brown-spotted, elliptic 5 
. P. pauper. 
Spikelets chestnut-brown. 
Leaves and stems slender - i . 38. P. rehmannianus. 
Leaves and stems capillary S : . 4. P. debilissimus. 
Perennials. Rhizomes or stolons frequent. 
Spikelets } in. wide : ‘ : : . 7. P. subtrigonus. 
Spikelets 2 in. wide at least. 
Stems and leaves slender e ; A . 6. P. nigricans. 
Stems stouter ; leaves thicker : . . 8. P. macranthus. 
°° PUNCTICULAT.—Superficial cells of the nut nearly square. Nut often appear- 
a ea very regularly, by reason of the light reflected from the convex surface of 
each cell. 
Stems clothed for }-} their length by leaf-sheaths, 
decumbent at the base. 
Spikelets turgid, greenish-brown, tinged dark- 
red : - ri . ° : Pua! baud LP sanguinolentus. 
Spikelets flattened, hardly turgid; glumes not 
inflated. 
Glumes green with black nerves . i . 10. P. atronervatus. 
Glumes rich or pale brown . . . 11. P. Muadtii. 
‘Stems enveloped by the leaf-sheaths only 9 little 
way above the base, 
