104 Scientific Intelligence. 
genealogical line, show us an original non- -dimorphic progenitor, and t 
= “aps ed plan by which it gave rise to a dimorphically character 
“The most noteworthy points are:—1. That, in a genus which has mat 
species with dimorphous flowers, there are some which present, so far 
known, only one of the two forms (say the long-styled, which is perfect 
fertile 2 se), as well as others with stamens and pisti] of equal len 
2. That the Red Cowslip, a clear variety of the common one, has 
non aie and, with this change of structure, has become much 
-. of seed than the heteromorphie unions of the Common Cow 
the Auricula offers a similar But, on the other hand, a none 
diinorphie variety of Primula aricstat is less fertile. ‘These pee 
the genetic system of a species seem very remarkable. 3. Still more 
common yellow form; this union, and also that of the Common Cow: 
fertilized by the Red, ee = sterile 7 thus supplying that desidera 
which has been calle r as a test, ee cd species prod 
through variation.” 4. That the two forms of a dimorphous species 
bridize with very different degrees of facility with disthact species. 
that such i i seed than either homomo 
at 
in 
to the relative position of die sites oe stigmas. 
tage of position in the latter is counterbalanced by an ies 
entiation of pollen and stigma with respect to their mutua 
date 
We may here ipo the remark that the Thymelzaceous genus - 
cosmia is dimorphous, and some species of Drymispermum exhibit 
not both of the two forms. 
2. Observations upon Dimorphous Flowers H. vi 
Bot. Zeitung, Oct. 1863, crassalyeda'? in Ann. Sci. s Wate Bot, Ap spl 180 
These observations are principally upon that case of dimorphism in ¥ 
besides the ordinary hermaphrodite (but often infertile) flowers, t2 
other and surely fertile ones, of simplified structure, apetalous, of 
eryptopetalous, and which, “ their development being as it were # 
in the bud,” and fertilized without opening, we had long ago 
Precociously fertilized.” Some remarks were made upon them 
Journal, in Decker 1862, (p. 419), stating that Nature, in t 
;as much pains to secure self-fertil lization as she does in the 
case of dimorphism represented by Primula, Houstonia, éc.,) tos 
cross-fertilization. This is the conclusion which het also reac 
eareful i investigation: of the commo 
tiens, Viola, Ozxalis 
n instances, viz: in Specularia, 
, clear showing that sith, ‘ewe, with 
sible exception in violets must needs be be self-f fertilized. Ther 
