362 Cooke and Schively on Observations on the 
have had an influence. The summer of 1899 was warm and 
clear. In 1902 there was considerable rainfall; and August 
and September were very cool months. 
In 1902 an attempt was made to study the comparative 
numbers of chasmogamic and cleistogamic flowers. There 
seems, however, to be the greatest possible variation; some- 
times the two are nearly equal, but often there is a marked 
difference. ‘The cleistogamic type predominates. The fol- 
lowing tables present some results of these observations. 
Number of 
Number of cleistogamic Number of Number of 
axes of flowersonlower chasmogamic  cleistogamic 
inflorescence. part of axis. flowers. flowers beyond. 
TAV Ate es MB cia creeas ater TOM ee ese petra: 3 
De siesersio cine GAs WAS StI IB retnie enstaactttectinre I 
CO TERRIA Teese eee ON ASE Rete ae — 
OE chee cioces | RAM AIOE SF alciatent aeieternere 2 
Cueinsicmnren hs TQ oareaientee ctor PRET aM oe ies Ne 2 
Poo aere etre enter FOS eye wereeeess Alera cis cust fete 4 
rhs CROP NA atoteve 2 OBO Gime ioe PD si sscetcda sav tone 3 
| OES biter rite Ea a ane FEN oe Qe etre eee 2 
repo cle aga ee ca IG ewe aE NCR Siete 2 
AR RICCI eeNS 1 Poe ensesten eet SH a A 4 
| Saat TM Te TAM elena cise Oetacansten 4 
RS ae A TASS every re pau A a 2 
roe Pca ent by at ti Io. Oe Ra ae crs — 
TOE ele eben ANC aR TO Kista ee ORE oui maeeiee — 
208 78 29 
* One cleistogamic flower among these. 
