“NOTES ON THE GENUS YUCCA. 297 
ADDITION TO ARTICLE ON YUCCA. 
[l. c. 1876, III. pp. 371, 372.] 
Page 47. Y. brevifolia has sessile, densely-flowered panicles ; flowers greenish-white, inconspicuous, and fetid. 
Flowers in April and May. — It is remarkable that at least in Southeastern Nevada [372], north of the great bend of 
the Colorado River, where Messrs. Johnson and Parry have repeatedly examined numerous plants, no fruit has ever 
been found. 
Page 54. Y. Whipplei has now become quite familiar through living specimens and beautiful photographs. 
From the latter we learn that the scape is imbricately covered with conspicuous, broad, at last patulous or drooping 
bracts, and that the panicle is densely flowered, narrow, spike-like, almost lanceolate 
~ 
III. NOTES ON THE GENUS YUCCA. NO. 2. 
{l. c. pp. 210-214.) 
Since my paper on Yucca was published (pp. 17-54 of this volume) I have been ena- [210] 
bled to make the following corrections and additions : — 
Page 20. The examination of more seedling erie has proved that the growth of the secondary axis and the 
young rootstock exhibits ee following forms: In Y. aloifolia as well as in Y. filamentosa, var. levigata, 1 have found 
a single horizontal branch ; in Y. angustifolia genuina and var. elato, a single perpendicular branch directed esigaeae 
and in Y. filumentosa genuina eg all the young plants examined at the end of the second year exhibited 2 to 
secondary axes directed downwards 4 to 2 inches and then abruptly bent upwards. More observations are needed eek 
these interesting peculiarities aka their constancy in each species or variety ; it is possible that the nature of the soil 
and the mode of cultivation may have some influence on them. 
Page 26. The bunch of white wool is always present at the tip of the perigonial lobes, but is very slight and 
short in some, and longer and more copious in other species ; the hairs constituting it consist of single or sometimes of 
several cells. 
Page 27. Yucca Tr ita has, as is also stated on p. 43, very thick ovules, and thus all Sareoyuceas have such 
ovules and can by them be readily recognized even in the flower and where the fruit remains unknown. _Y. gloriosa 
with its 4 ovules does not belong to this section at all, as will be shown below. 
Page The stigmatic tube does communicate directly with the three ovarian cells, but the passage closes 
fetes after the night of flowering. 
Page 29. I have seen the vestiges of the moth, or rather its larva, in all the Sarcoyuccas as well as in all [211] 
those with dry pods ; but fruits which show no trace of the larva may be seen more frequently in the form 
than among the latter. This does not indicate that all may not have been fertilized by the action of the moth, but in 
such cases either no eggs were laid or they may have aborted 
Observations made last year by Mr. Riley and myself have proved that the filiform flexible egg of the moth is 
not deposited with the pollen into the stigmatic tube, but that the mother introduces it through a puncture in the 
side of the ovary directly into one of the cells just between two ovules, both of which at once begin to swell up to 
three or four times the thickness of the healthy ovules, and are thus preparing the sustenance of the young larva, 
which feeds on one or usually on both of them until able to attack the meanwhile more or less developed young seeds 
joining the former. In a few cases I have seen the very young larva at a place where four ovules, two from each side, 
meet, and here all four were prematurely enlarged. 
Page 31. See below an account of the fruit of the Clistoyucca. 
Page 34. At the end of the character of Yucca add: floribus majoribus pendulis nocturnis albidis nunc virescenti 
seu purpurascenti colore tinctis olentibus. 
Page 36. Southerners object to the remark, that the fruit of Y. aloifolia is “ much eaten ;” I should say that it 
is edible. I am informed that on the coast of Florida this species makes almost impenetrable thickets, in which 
bears have their passages and no doubt their lairs, and in the fruit of which they delight 
Page 37. Y. aspera and Y. albospica are erroneously introduced here ; for their proper place see below. 
38. Y. gloriosa does not belong to Sarcoyucca, where, relying too much on the statements of others, I had 
placed it, Dr. A. Schott, who has repeatedly been mentioned by me as a close observer of Yuccas in the Southwest, 
38 
