262 Eacerpta Botanica. 
I first collected L. minor in flower and fruit at Berlin in 1835, 
and since that time I have each year detected it again in the same 
state whenever I searched with care. 
2. L. trisulea, Linn. Frondes lanceolate, apice repando-dentate, 
tenues, in stipitem elongatum persistentem attenuate, ideoque 
multifariam aggregate, exclusis floriferis submersee. Stauroge- 
ton, Reich. LL. intermedia, Ruthe. L. cruciata, Roxb. 
In 1836 I found L. trisulca in flower, and have since regularly 
detected the flowers wherever I encountered this species. The 
reason why this species has been so rarely found in flower, is that 
the search has been made at too late a period, as it generally flowers 
abundantly in April and the beginning of May. ‘The flowers will 
be seen on those plants which are submerged near the surface; 
after flowering they multiply themselves laterally and are then sub- 
merged. 
Il]. THELMATOPHACE. 
Spadix brevissimus, sed discernendus. Flores masculi duo. Fila- 
menta recurva, medio dilatata; ovarium uniloculare, bi-multi- 
ovulatum, ovulis erectis anatropis; stylus elongatus, recurvus ; 
fructus: capsula membranacea, dehiscentia circumscissa, di- 
polysperma; semina erecta; albumen paucissimum; embryo 
ovatus ; plumula maxima; radicula infera. 
1. T. gibba. Frondes obovate vel suborbiculate, adultz inferne 
vesiculoso-convexe ; stipite frondis novelle discreto, fragillimo, 
ideoque frondibus adultis subsolitariis. Lemna gibba, Linn. 
8. trichorhiza, fronde superne rubente, radice longissima. Lemna 
trichorhiza, Thuill. 
In 1837 I first observed T. gibba in flower, and since frequently. 
It is the rarest species at Berlin. 
+t Vasis spiralibus in tota planta conspicuis ; Sronde novella stipulis binis 
(inferiori et superior) membranaceis aucta, polyrhiza. 
IV. Sprropera. 
Flores masculi duo; filamentis inferne angustatis. Flores feminei 
Ovarium biovulatum, ovulis erectis anatropis; stylus 
ie deta de Oe 5 EME SOS ety 
1. S. polyrhiza. Frons planiuscula, nervis palmatis, polymorpha, 
orbiculari-ovata; apice obtuse vel acuto. Lemna polyrhiza, 
Linn. L. bannatica, Kit. L. orbicularis, Kit. L.thermalis, P. 
Beauv. L. orbiculata, Roxb. 
Notwithstanding the most careful search I did not detect S. 
polyrhiza in flower until 1839, when I found at Werningerode the 
male flowers, or those in which the pistil is imperfectly developed. 
The only previous notice of the flowers of this species is in Wiggers 
Prim. Fl. Holsat. 
oe ee we ee > 
APPENDIX. 
Lemna arhiza, Mich. according to the observations of Hoffmann 
is a good species, but, as the flowers and fruit are still wanting, 
