38 
PACIFIC SCIENCE, VoL IV, January, 1950 
or rooted cuttings, and, whenever possible, 
from suitable flowering material. Root tips 
were stained by the crystal- violet-iodine 
method following Randolph’s (1935) sched- 
ule. Anthers from young buds were exam- 
ined in smear preparations with the use of 
iron-acetocarmine (Belling, 1926). 
The figures were drawn with the aid of a 
camera lucida. 
OBSERVATIONS 
All species and subspecific forms for which 
chromosome numbers have been determined 
are listed in Table 1. They are placed in the 
table in the order in which they occur in 
Killip’s (1938) systematic treatment of the 
genus. Interspecific hybrids which are not 
included in Killip’s treatment are placed at 
the bottom of the table. The list comprises 
16 species, 1 botanical variety, 4 botanical 
forms, 4 interspecific hybrids, and a poly- 
ploidal race of one species. 
Six of the seven species listed in the chro 
mosome atlas of cultivated plants (Darling- 
ton and Janaki Ammal, 1945: 114) are 
reported to occur in Hawaii (Neal, 1948: 
522-525). These species are P. caerulea L., 
P. edulis Sims., P. foetida L., P. incarnata L., 
P. quadrangularis L., and P. racemosa Brot., 
all of which are reported to have chromo- 
some numbers of 2n - - 18. The seventh 
species, P. lutea L., with a chromosome num- 
ber given as "2n = 84?,” is not known to be 
in the islands. Of the 22 species listed by 
Neal (loc. cit. ) , the writer was unable to 
obtain material of the following seven: P. 
alata Dry., P. coccinea Aubk, P. antioquiensis 
Karst., P. kermesina Link and Otto, P. race- 
mosa Brot., P. Banksii Benth., P. fruticosa 
Killip. 
TABLE 1 
Chromosome Numbers of Various Species, Subspecific Forms, and Interspecific Hybrids 
OF Passiflora 
PASSIFLORA SPECIES 
CHROMO 
N 
SOME NUMBER 
2n 
P. suberosa L. . 
12 
24 
P. suberosa (triploid) 
18* 
36 
P. lutea L 
84 ?f 
P. pulchella HBK 
*6 
12 
P. mollissima (HBK) Bailey . 
18 
P. manicata (Juss.) Pers. ............ 
.... 
18 
P. viti folia HBK 
9 
18 
P. quadrangularis L. 
18 
P. ligularis Juss. 
.... 
18 
P. Seemanni Griseb 
9 
18 
P. maliformis L 
9 
18 
P. laurifolia L 
9 
18 
P. incarnata L 
18 
P. edulis Sims 
9 
18 
P. edulis form flavicarpa Degener 
9 
18 
P. caerulea L. 
9f 
18+ 
P. subpeltata Ortega .............. 
9 
18 
P. foetida L. 
10 
20$ 
P. foetida ( 3 variant forms ) § 
10 
20 
P. foetida variety gossypifolia ( Desv. ) Mast. ...... 
10 
20 
P. Pfordti ( = alata Dry. X caerulea L. ) 
P. maliformis L. X laurifolia L 
XP- caerulea L. (hybrid) (Degener, 1934) 
P. princeps-coccinea ( = racemosa Brot. X coccinea Aubl. ) 
' 9t 
18 
18 
18 
18+ 
* Some meiotic irregularity. 
t Reported in Chromosome Atlas (Darlington and Janaki Ammal, 1945: 114); not seen by author. 
? Reported as 2n = 18 by Janaki Ammal (Darlington and Janaki Ammal, 1945: 114) . 
§ Variety or form names, if any, not determined by writer. 
