TRIANDRIA MONOGYNIA. 273 
172. Cyperus nernorosuB, 
C. radice fibrosa, spiculis rorymbosts distantibus lineari- 
bus, involucro umbella longiore, partiali diphyllo sc- 
tacco. 
G nemorosus Meyer Essequeb. p. 31* Roem. et Scb. syst. 
veg. mant. 2. p. 116. Spreng. syst. veg. 1. p. 224. 
Habitat in nemorosis insulae Arowabisch 2^. 
Culmi caespitosi, 1-2 ped., penna columbina tenuiores, 
trigoni, striati, glabri, inferne foliosi. Folia ut plurimum 3, 
laxa, linearia, culmo breviora, lineam vix latiora, carinata, 
glabra, margine laevia. Vaginae tenerae, membranaceae, ca- 
nescenti -bninneae. Involucrum 3-rarlus 4 phyllum j phylla 
culmi planiusciila, maximum umbella triplo longius, quar- 
tum, si adest, longitudine umbellae. Involucella e phyllis 
sub spiculis infimis, iisdemque brevioribus, suboppositis. 0- 
chveae truncatae, in mucrones virides aciimiatae. Umbella sim- 
plex, 3-4 radiata, radii 1-2 poli., filiformes, tereti - suban- 
gulatl, glabri. Spiculae 3-S, alternae, distichae, patenli-di- 
vergentes, acuminatae, planiusculae, basi bractea oblonga acu- 
minata, 12-15 florae. Valvae lanceolato- oblongae, compres- 
sae, nervo dorsali viridi, striis 1 - 2 in utroque latere, mar- 
gine latiusculo albo eleganter variegatae. Nux ovato-oblonga, 
triquetra, albescenti - brunnea. (Meyer.) 
173. Cyperus Hydra» 
C. radice tuberosa, culmo triquetro, foliis glabris carina- 
tis culmo brevioribus, umbella subsexradiata involu- 
crum subtripbyllum aequante, radiis polystachyis , spi- 
culis linearibus alternis, valvis ovatis obtusis mucro- 
nulatis, stvlo bifido, nuce triquetra apiculata. 
C. Hydra Micbx. amer. 1. p. 27. Vahl Euum. 2. p. 344. 
Poir. Eiic. Metb. 7. p. 25i. Pursb. amer. 1. p. 52. 
Humb. Bonpl. et Kuntb nov. gcn. et sp. 1. p. 205. 
Roem. et Scb. syst. veg. 2. p. 201. mant. 2. p- 115. 
Meyer Esseq. p. 31. Kuntb syn. 1. p. 140. Elliolt Bot. 
of Carol. and Georg. 1. p. 68. t. 2. f. 2. Spreng. syst. 
veg. l.p. 224. Pressi, lleliq. Haonk. fasc. 3. p. 175* 
Habitat in America boreaH et in Mexico 2}.. 
Radix stolonifera, fibrosa, tuberibus pendulis subglobosis 
1 poli, in diametro. Culmi 6-12 polK alti, erecti, striati, 
obtuse triquetri, glabri, basi vaginis foHiferis tecti. Folia om- 
nia culmo breviora, 2-3 liu. ad basin lata, stibulato-acumi- 
nata, recurvata, parum canaliculata, laevia, subtus siibglau- 
cescentia; vaginae pollicares, glabrae. Umbella simplex, 4-6 
radiata, radii exteriores 1-2 polli(-ares; interiores semipolli- 
cares et breviores. Spiculae in apice radiorum 5-7, subap- 
proximatae, alternae, brevissime pedicellatae, interdum binae 
aut ternae in apice pedunculo elongato, lineares, 6 lin. lon- 
gae, lineam latae, acutae. Involucrum 2-3 phyllum, pbylla 
t«a. Spec, Pl. T. I. PI. Sect. II. S 
