404 ON APONOGETON. 
The amended character of the two genera would therefore 
stand as follows: 
APONOGETON. 
Flores hermaphroditi. Sepala 2 colorata, persistentia. Sta- 
mina 6-18; filamentis liberis, subulatis, patentibus, persis- 
tentibus ; antheris bilocularibus, lateraliter dehiscentibus ; 
polline gibbose-ovoideo. Ovaria 3-5, erecta, rostrata ; 
stigmate apicali, obliquo, minuto. Ovula 26, basi fixa, 
ascendentia.  Folliculi 3-4, introrsum  dehiscentes, 1-3 
spermi. Semina erecta, ovata, exalbuminosa; testa du- 
plici, exteriore herbaceá, interiore membranaceà. Embryo 
erectus, ascendens, anatropus, cotyledone solida, plumula 
inconspicua. Cotyledon germinans in cornu elongatur et 
plumula diutius e basi lateraliter fisso evolvitur, foliolo 
elliptico.—Herbe aguatice, radicibus tuberculosis, scapis 
longis, foliis emersis v. natantibus. 
Species 1. A. distachys. 2. A. semicylindraceus. 3. A. 
dispermus. 4. A. angustifolius. 5. A. echinatus. 6. A. 
monostachys. ~ = 7 
6. A. monostachys ; foliis lineari-oblongis emersis, floribus 1n 
spadice simplici spiraliter dispositis dense confertis. io 
Radix tuberculosa, fibrillis crassis ad apicem tuberculi singuli 
spherici. Folia petiolata, petiolis longis, subtrigonis, basi 
membranaceis interiore amplectentibus, laminis lineari- 
oblongis, obtusis, basi sub-cordatis v. junioribus cuneati$ — 
5-nerviis cum venis transversalibus. Scapus longus oyin- ae 
dricus.  Spadix cylindricus,* simplex. Flores dens 
spiraliter dispositi ; sepalis binis obovatis, basi oblique 
cuneatis ceeruleis ; junioribus imbricatis. Stamina 6, n 
mentis crassis sepalis sub-longioribus ; antheris cœruleis 
subquadratis, bilocularibus, lateraliter dehiscentibus; pOl- 
* Roxburgh describes the rachis as waved ; but I could not u 
appearance nor could I detect the spathe, which if it exist must fall 08 
extremely early. € VI 
