CYPERACEAE 149 
mm. long, 3—4 mm, wide, yellow: seales ovate, 3 mm. long or dei blunt, hooded 
t the apex, the tips appressed: achene ovoid or oval, phe . long or less, 
Ex ns T sessile, less than 15 as long as the s ud [C. denta atus 
multiradiatus Torr. E sand-dunes, low grounds, aud pond-margins, 
Coastal Plain, "la. to L 
27. C. rotundus L. Plant apu by tuberous eigen 2-6 dm. tall, 
gregarious, deep- B spikelets in lax elusters, linea often narrowly 80, 
. long, wide, mainly purple- Lodi EN ovate to eliptic- 
b c or ba "the tips appressed: achen a 1-1.5 mm. long, 
mucronate, about V5 as long as the — (NUT Ss. Coco-GRASS.)—Sandy 
fields, law Lo an i aay i Coastal Pisin, Fila. to T Tex. and Va. Nat. of the 
trop.—(W. I ; €. .)—Often becomes a troublesome weed 
through n. by 2c Mea whieh are edible. 
28. C. esculentus L. Plant ne by tuber- pui age eee up to 
tall, tufted or gregarious, bright-green: spikelets spikes or Mere 
lanceolate to ii a a p^" Dr do mm. eee or rarely longer, 2-3 
mm. wide, stra or yello h-brown: seales ovate to elliptic-ovate, 2-3 
mm. jus ind “the tip rather dou achene obovoid or ellipsoid, nearly 1.5—2 
mm. long, mucronate, somewhat shone than the scale. [C. phymatoides 
Muhl]—(CnHuFA. EARTH-ALMOND. YELLOW NUT-GRASS .) —Low grounds, moist 
rd. river- be d a a and b apos various provinces, Fla. to Tex., Minn., 
A. B.; oW N.A —(W. I., Mez. ,C. A., O. W.)—Som are a trouble- 
we ed. geen for hogs, on account "of the tuberiferous rootstocks 
"which are edible. 
29. C. lutescens Torr. & Ho ok. Plant perennial by elongate, often tuber-bear- 
ing, rootstocks, E mostly 3—9 dm. tall, bright-green: spikelets in lax 
spikes or panicles, rowly linear, often curved, 20-40 mm. long or sometimes 
shorter, 1.5—2.5 a, en stramineous: scales ovate, 3-3.5 mm. long, rounded 
at the apex or abruptly pointed, the tips becoming lax: e ellipsoid-obovoid, 
nearly 2 mm. long, mucronate, about l5 as long as the seale.—Dry sandy soil 
and swamps, Coastal Plain, Fla. to Tex.—(Mez., C. A., S. A.) | 
30. C. articulatus L. Plant perennial, up to 20 dm. tall gregarious, the 
nearly terete scape smoo oth, the leaves d pube by basal sheaths: 
bracts of the involucre very short: spikelets in lax umbel- "d “spikes, narrowly 
linear, 20—50 iei ong, or sometimes shorter, mo wide, stra 
neous: seales mainly ovate, mm. long, a acutish or blunt, appressed or De 
coming lax: are ellipsoid to euneate-ellipsoid, 1.5 m . lo ong or nearly so, 
mucronate, about 15 as long as the scale —Calcareous swamps, onde "aa 
eus 
and ereeks, Coastal Pisin, Fla. to Tex. and S. C.—(W. I., Mez., C. A., 
O. W.) 
Mdb E Ad Muhl. Plant anual 1-5 dm. tall, solitary or gregarious, 
a scape rough-angled above: bracts of the involuere elongate: spikelets in 
dense pis or panicles, linear, 6-25 mm. long, 1-1.5 m pire, chestnut-brown: 
scales vate, or sometimes elliptic- Janecolate, about 1. 5m . long, obtuse or 
uni pointed, the tips scarcely lax: achene obovoid, nearly 1 mm. long, 
slightly mucronate, ome 16 - eee as the scale. — Swamps, river- 2 and wet 
soil, various provinces, Fla. to Tex., Calif., Minn., Ont., and Mas 
32. C. Halei Torr. Plant annual, up to 1 m. tall, tufted or gregarious, bright- 
green: spikelets crowded in cylin ndrie spikes, linear, 3-5 mm. long, about 1 mm. 
wide, brown: seales broadly elliptie or obovate, 1-1. 5 mm. long, mucronulate, 
the tips becoming A lax: achene obovoid, about Lt mm. long, as long as 
the scale or nearly so.—River banks and swamps, Coastal Plain, Fla. to La., 
and perhaps in p Miss. Valley 
