144 MISSOURI BOTANICAL GARDEN. 
giant ’’ of its genus, the development which it may as- 
sume when grown in the open air in a favorable climate 
still more justifies the intensive specific name given to it. 
MEMORANDA ON THE POLLINATION OF YUCCAS. 
In the Fourth Report of the Garden a résumé of what 
was then known of the pollination of Yuccas was given, and 
the results of a somewhat extensive field study of several 
species were published.* Since the publication of that 
paper, so far as I know, no considerable addition has been 
made to our knowledge of the subject, except that in the 
following year Professor Whitten filled a gap in the obser- 
vations on Y. filamentosa by observing and describing the 
circumstances attending the emergence of the Pronuba 
larvae from the capsules of that species. 
In the meantime the arborescent species have been sub- 
jected to a critical systematic study by Professor Sargent, 
who has found it necessary to adopt names for some of the 
species which differ from those employed in my ecological 
paper, so that, as a means of avoiding confusion it is to be 
noted that the following changes in nomenclature should be 
made in my paper, to conform it to Professor Sargent’s 
revision. tf 
Y. baccata, Trelease, Rept. 3. pl. 2.— 4: 185-190. pl. 
20, which is the arborescent form, becomes Y. Mohaven- 
sis, Sargent, Silva 10: 15-16. pl. 500. No observations 
on the pollination of the true dwarf Y. baccata, therefore, 
appear to have been published. 
Y. australis, Trelease, Rept. 4: 190-192. pl. 4-5, by 
priority becomes Y. macrocarpa, Coville,— Sargent, Silva 
10: 13-14. pl. 499. In the early part of 1897, while at- 
tempting to study the pollination of Y. Treculeana, in 
* Trelease, Further studies of Yuccas and their pollination. Rept. 
Mo. Bot. Gard. 4: 181-226. pl. 7-10, 15-23. 1893. 
+ Whitten, The emergence of Pronuba from the Yucca capsules. 
Rept. Mo. Bot. Gard. 6: 187-8. 1894. 
t Sargent, The Silva of North America 10. 1896. 
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