l'ersuch einer Monographie der Gattung Ephedra. 253 
distinctus, genera duo, habitu valde dissimilia, alterum tropicum, alterum 
extratropicum, amplectens. 
GNETUM Linn. 
Linn. Mant. p. 125; Blume !, c. p. 102; Endlicher L. c. p. 263; Meis- 
ner L. ©. p. 352 et Comment. L. c. p. 263; Brongniart in Duperrey Vor. 
autour du monde Vol. II p. 5 etc. tab. I Spach L. c. p. 283. 
Amenta monoica aut dioica, cylindracea, articulata, interrupte verticil- 
lata: verticills singulis involucro abbreviato cupuliformi fultis. Flores paleis 
setaceo-dilaceratis (pilis fasciculatis articulatis submoniliformibus, Brong.) 
immersi, masculh et foeminei in eodem amenti verticillo, vel in diversis 
verticillis, vel etiam in distinctis amentis (an in diversis arboribus?). Was. 
Vaginula bifida, stamen solitarium fovens. Anthera bilocularis: loculis con- 
tiguis vel in filamenti cruribus sejunctis, apice rimula dehiscentibus.  Foe- 
mina. Involucrum: vagina solitaria, ventricoso-tubulosa, apice poro pertusa, 
uniflora, in fructu succulenta. Involucellum ventricoso-tubulosum, apice 
poro pertusum, semen nudum includens. Cotyledones in corpus solidum, 
apice bidentatum connatae. 
Arbores erectae vel frutices sarmentosi, in Asia tropica et in Guiana 
Americae provenientes, ramis geniculato-nodosis, foliis oppositis ovatis, 
amentis axillaribus et terminalibus elongatis pedunculatis. 
EPHEDRA Tournef. 
Tournef. Corollar. Instit. rei herb. p. 53 tab. #77. Linn. gen plant. 
ed. 1 p. 312; Endlicher L. ce. p. 263; Meisner L, ce. p. 352 et Comment. 
L c.; Richard Comment. botan. de Conifer. et Cycad. p. 135, tab. k 
et 29, Spach Hist. nat. des Veget. T. XI p. 287. 
Amenta mascula et foeminea subglobosa in diversis plantis, rarius in 
eadem stirpe. Mascula e vaginis bifidis decussatim superpositis composita. 
Flores solitarii, in vaginarum axillis oppositi: vaginula bifida, e fundo co- 
