en i i eet Celis ie ie 
HYBRIDS AMONG THE AMARYLLI® AND CACTACE®. 407 
A LIST OF SOME ASCERTAINED INTER-SPECIFIC HYBRIDS t 
AMONG THE CACTACEZ. 
Parentage. Name of Hybrid. Authority. 
1. Phyllocactus | bs | Cereus Wee @ioper: MEcholson * 
crenatus } . grandiflorus J 
2. 3 x P. phyllanthoides = P. Vogeli De Laet 
3. i x Epiphyllum sp. = alleged hybrid, circa 1870 Hovey * 
4. ss x (unknown) = = re 3 “Bot. Reg.” 
1844, 317 
5. P. Cooperi x P. Ackermanni = P. Coopermanni Worsley 
6. P. Ackermanni «x P. Cooperi = P. Helene = 
hia feos * C-speciosts «1 = G: Reastii, de: De Laet 
(Schumann) ) 
8. 3 x C.MacDonaldie = (unflowered) Worsley 
9. C. MacDonaldie x Phyllocactus sp. = x Kew 
10. C. speciosissimus x P. Ackermanni = C. unnamed Laboret 
pe = x C. flagelliformis = C. Mallisoni (‘ Bot. Mag.”’ ie 
- 3822) 
12. os x 2 = 5 more alleged hybrids Ae 
13. - x (unknown) = C. hybridus Hort. Berol. 
14. i x 5 = Epiphyllum (?) hybridum Hort. 
15. C. grandiflorus x C.speciosissimus = C. Haagei Laboret 
16. Ps x = C. Maynardii Lem. 
17. = x " = 7 more alleged hybrids Laboret 
18. br x C. affinis (?) = C. albisetosus Monville * 
19. a x P. crenatus =F. Wray Giirke * 
Nore.—All those eeerednaes some doubt attached to them, which is dealt with 
below. 
Some, at least, of the genera in the order Cactace@ are badly founded, 
and it is quite clear that Cereus and Phyllocactus are one genus, and not 
two. Presumably the latter habit of growth is antecedent to the former 
(geologically), following the known sequence of change (differentiation) 
from the simpler to the more complex. Hence crosses between the two, 
however many-angled they may be in their seedling stages, approximate 
to Phyllocactus (in the stem) when they reach the flowering stage. = 
Hybrid No. 1.—I do not think that the original P. Cooperi' was a 
hybrid. Mr. Cooper, after whom it was named, tells me that at the time 
no hybrid origin was claimed for it. Beyond this it exhibits no trace of 
hybrid origin, and is in close alliance with P. grandis (Lem.), although 
not in identity therewith. I have, therefore, treated P. Cooperi as a 
species. The splendid (white to lemon-yellow) flowers of P. Cooperi are 
borne generally on the lower half of the stems, and often on the ground- 
level, but are occasionally also terminal. It is a night-opening cactus, 
and each flower lasts for two nights and two to three days; for a few 
hours shortly after expansion, they exhale an astonishing lemon-like 
fragrance. It fruits freely, and may be grown in a cool house. Even 
admitting the contention of Messrs. Nicholson, de Laet, and others, that 
hybrids have been raised identical with P. Cooperi, this would not prove 
that the original P. Cooperi was a hybrid. 
+ Throughout this paper the female parent (of every cross-bred plant) is given 
first. 2 
t Some exceptions exist. 
