Hawaiian Hibiscus — -Roe 
5 
KEY TO KNOWN HAWAIIAN MEMBERS OF THE GENUS Hibiscus 
A. Corolla yellow B 
B. Calyx 10-veined; petals 3 .0-4.0 cm. long C 
C. Leaves deeply lobed; bracts 8-10, glabrous, terete, nonglandular; calyx glandular; petals 
3.0-3. 5 cm. long, ca. 2.5 cm. wide; staminal column 4.0-4.5 cm. long.. ..2. H. Brackenridgei 
C. Leaves moderately lobed; bracts 7-8, hirsute, terete, nonglandular; calyx nonglandular; 
petals 3. 0-4.0 cm. long, ca. 5.0 cm. wide; staminal column 7. 0-8.0 cm. long 
5. H. Brackenridgei var. mokuleiana 
B. Calyx 5 veined; petals more than 4.0 cm. long D 
D. Leaves deeply lobed; bracts 8-9, hirsute, terete, glandular; calyx nonglandular; petals ca. 
5.0 cm. long, 4.3 s — 4.5 cm. wide; staminal column 4.0-5. 0 cm. long 
3. H. Brackenridgei var. molokaiana 
D. Leaves entire to shallow lobed; bracts 5, hirsute, nonterete, nonglandular; calyx gland- 
ular; petals 5.7-6.0 cm. long, 4.8-5.0 cm. wide; staminal column 2. 3-2. 5 cm. long 
4. H. Brackenridgei var. kauaiana 
A. Corolla not yellow E 
E. Corolla pink; plant densely hirsute; bracts 10-12, bifid, 1.0-1. 3 cm. long, ca. 1.0 mm. wide; 
calyx glandular, lobes 2. 3-2. 5 cm. long, cleft 1.0 cm. from apex 1. H. Y oungianus 
E. Corolla not pink; entire plant not densely hirsute; calyx nonglandular F 
F. Corolla red G 
G. Calyx glabrous; petioles 2. 0-4.0 cm. long; staminal column 5.5-57 cm. long; petals 
5.5 cm. long, 3-5 cm. wide H 
H. Calyx 2. 8-3.0 cm. long; 1.2 cm. wide; lateral calyx nerves fused immediately below 
cleft 6. H. Kokio 
H. Calyx 2.4-2. 5 cm. long; 1.0 cm. wide; lateral calyx nerves fused 5-10 mm. below 
cleft.... 7. H. Kokio var. pukoonis 
G. Calyx nonglabrous; petioles less than 2.0 cm. long; petals more than 5.5 cm. long, less 
than 3.5 cm. wide I 
I. Staminal column more than 5 cm. long; peduncles more than 1.0 cm. long J 
J. Calyx cleft 1.2-1. 3 cm., pilose; petioles 0.5-1. 8 cm. long; petals 6.5-67 cm. 
long, 2. 5-3.0 cm. wide; staminal column ca. 6.0 cm. long 8. H. Saintjohnianus 
J. Calyx cleft 2. 0-3.0 cm., pubescent; petioles 0. 3-0.8 cm. long; petals 6.0-6. 5 
cm. long, 1.0-1. 2 cm. wide 9. H. kahilii 
I. Staminal column less than 5 cm. long; peduncles less than 1.0 cm. long 
10. H. Newhousei 
F. Corolla white K 
K. Staminal column white, leaf margin denticulate, apex rounded 11. H. immaculatus 
K. Staminal column red, leaf margin entire or serrate, apex almost acute L 
L. Leaves velvety to the touch; calyx cleft 1.0-1. 5 cm.; bracts 1.5-2. 5 cm. long 
- 12. H. waimeae 
L. Leaves lack velvety touch; calyx cleft only 0.5 cm.; bracts 0. 5-1.0 cm. long M 
M. Leaves 4-10 cm. long, 4—7 cm. wide, ovate to elliptical-parabolical, glabrous; 
petioles 0. 5-2.0 cm. long, glabrous.... N 
N. Leaves 8-10 cm. long, 5-7 cm. wide; calyx 2-3 cm. long.. ..13. H. Arnottianus 
N. Leaves 4-6 cm. long, 4-5 cm. wide; calyx 1-2 cm. long 
14. H. Arnottianus f. parviflora 
M. Leaves 10-25 cm. long, 8-20 cm. wide, ovate-subcordate, pubescent; petioles 
3-12 cm. long, densely puberulent 15. H. Arnottianus var. punaluuensis 
