BIGENERIC ORCHID HYBRIDS. 161 
List of Species, the numbers agreeing with those in the foregoing 
Diagram. 
1. Cypripedium barbatum. 14. Cypripedium concolor. 
2. —— philippinense. 15. niveum. 
3. —— Stonei, 16. —— purpuratum. 
4. —— Lowei. 17. —— Spicerianum. 
5, —— Fairrieanum. 18. — Druryi. 
6. superbiens. 19. Argus. 
7. ——- villosum, . javanicum. 
8. —— insigne. 21. Selenipedium caudatum. 
9. Lawrenceanum. 22. earcei. 
10. —— Hookere. 23. —— longifolium (Roezlii). 
11. Dayanum. 24, —— caricinum. 
12. —— hirsutissimum. 25. ——- Schlimii. 
13. venustum. 
The above table shows that Cypripedium barbatum has been 
crossed with one species of Selenipedium and with fourteen species 
of Cypripedium. Of these fourteen species five have also been 
crossed with five other species, while the species of Selenipedium has 
been crossed with two other species of that genus, and these again 
with yet two additional ones. That is, twenty species of Oypri- 
pedium and five species of Selenipedium have been connected by 
artificial hybridization; and these again have been connected by 
Selenipedium caudatum crossed with Cypripedium barbatum; so 
that all these twenty-five species, of two genera, may be said to be 
linked together by the skill of the hybridist. The diagram is 
not arranged to show the various combinations which have been 
effected between these species, which details can be better 
expressed as in Table II. (See p. 162.) 
From this table we see that thirty-three combinations bave 
been effected between the twenty species of Cypripedium, and 
five combinations between the five species of Selenipedium ; while 
the two groups have been connected by the hybrid raised from 
Selenipedium caudatum crossed with Cypripedium barbatum*, or 
thirty-nine hybrids altogether. All these hybrids, with the ex- 
ception of the last-namedf, have flowered, received distinctive 
Names, and are now in cultivation in various horticultural 
establishments. 
* “ One thing is certain, the three-celled ovary of the Selenipeds offers no im- 
pediment to fertilization by the pollinia of Cypripeds with a one-celled ovary, for 
we have plants raised from C. caudatum [ Selenipediuen] x C. barbatum, and many 
other like crosses have yielded seed." — Veitch, Journ. Hort. Soc. n. s. vii. p. 30. 
f This hybrid is in many respects à remarkable one. It was raised about 
1872; and although the plants continue strong and healthy in appearance, and 
increase in size every year, yet up to the present time not a single plant has 
flowered. 
LINN, JOURN.— BOTANY, VOL. XXIV. P 
