OPHRYDE.JE. 297 
CLXXIX. PERISTYLUS. 
Peristylus. Blume, Bijdr. 1, 404. Benthamia. Ach. Rich. Orch. Maurit. 
Omnia Platanthere ; sed calyx semper campanulatus et calcar brevissi- 
mum szepiüs scrotiforme. 
Although this genus is separated on apparently very slight grounds 
from Platanthera and Herminium, yet it collects a natural group of species, 
and must, I think, be adopted. See obsérwations under Herminium, to 
which I formerly referred all the species. 
l. PEnisTYLUS Chorisianus. 
P. foliis binis lato-ovatis acutis, spicà pauciflorà laxiusculà, bracteis ovatis 
acuminatis floribus longioribus, sepalis ovatis obtusis membranaceis 
patentibus, petalis carnosis subrotundo-ovatis conniventibus, labello 
ovato canaliculato obtuso apice cucullato, calcare brevissimo subtereti. 
Habenaria Chorisiana. Chamisso in Linnea, 3, 31. 
Hab. in Unalaschka, Chamisso. (exam. s. sp. in herb. Hooker.) 
Caulis vix palmaris. Calcar scrotiforme sec. cl. Chamisso. 
2. PEnisTYLvs islandicus. 
P, caule diphyllo, bracteis foliaceis : inferioribus spicà 4-5-florà longiori- 
bus, sepalis ovato-lanceolatis, petalis triplo angustioribus, labello lanceo- 
lato indiviso, calcare scrotiformi subdidymo. 
Hab. in Islandia, (exam. s. sp. in herb. Lehmann.) 
Tota planta vix 4 poll. alta. Folia oblonga, complicata. Flores cam- 
panulati, Herminio Monorchi duplo majores. 
3. PeRisTYLUS obsoletus. 
P. * labello oblongo lanceolato indiviso, petalis erectis, cornu eee 
scrotiformi, germinibus pedicellatis, scapo nudo, bracteis brevissimis 
squameformibus.” W. 
Orchis obsoleta. Willd. Sp. Pl. 4, 34. 
Habenaria obsoleta. Spreng. Syst. veg. 
Hab. in America septentrionali in locis umbrosis ; a Noveboraco ad Vir- 
giniam, Beck ; Pennsylvania, Muhlenberg. 
3. Beck. Bot. M. and N. North Amer. p. 348. 
4. PEnisTYLUs latifolius. 
P. caule basi folioso, foliis 9-3 ovali-oblongis acutis basi amplexicaulibus, 
spicà longissimà cylindraceà, labello concavo obsolete? trilobo acuminato 
petalis conformi, calcare apice inflato. 
Satyrium latifolium. Thouars, Orch. Afr. t. 10. 
Benthamia latifolia. Ach. Rich. Orch. Maur. t.7, no. 2. 
Habenaria chlorantha. Spreng. Syst. 
erminium latifolium. Lindl. in Bot. Reg. 1499. 
Hab. in Borbonia, Thouars; Mauritio, Bouton. (hab. 
Bouton.) 
s. sp. comm. cel. 
5. Peristytus Commersonianus. 
E. x foliis tribus ad basin caulis rosell 
cili; spicà longa; floribus minutis; 
naliculato, calcare brevissimo recurvo. 
October, 1835. aq 
atis ovali-acutis nervosis ; caule gra- 
labello subtriangulari, basi subca- 
