Sapotaceae. 



occurring in 8. rliyncliospermnm Rock. They are ovoid and of a deep purplish 

 black color. The fruits of 8. sandwicense (Gray) B. & H. are pear-shaped to 

 ovoid and also black and long peduncled, while those of 8. auahiense Rock and its 

 varieties on Hawaii are bright citron yellow, globose to top-shaped and sessile. 

 The writer has collected large material of this genus from numerous localities. 

 That 8. auahiense is a good species is brought out by the fact that the latter 

 grows in company with 8. sandwicense with black ovoid fruits on the lava fields 

 of Auahi, Maui, and nothing is more in contrast than to see these two species 

 growing side by side, especially when loaded with respectively the bright yellow 

 and the black fruits. On the slopes of Haleakala, back of Makawao, the writer 

 collected specimens of a tree with large cone shaped, whitish-gray fruits, whose 

 seeds differ decidedly from all the other Hawaiian species, while in the same 

 locality only 50 yards off grew the typical 8. sandwicense. 



On Molokai occurs a very small-leaved species, which was unfortunately not 

 in fruit, perhaps a form of 8. spathulatum Hillebr. from Lanai. On the latter 

 island the writer collected the largest leaved Sideroxylon with long pear-shaped 

 black fruits. Another form was in flower only, the latter being of exceedingly 

 large size compared with the other Hawaiian Sideroxyla. All the specimens col- 

 lected by the writer on Kauai are one seeded, while those from the other islands 

 are all five seeded, save a few exceptions. 



The* Hawaiian species of Sideroxylon may be arranged as follows : 



KEY TO THE SPECIES. 



Flowers 2 to 4, in clusters, pedicellate. 



Fruits globose ovoid to obovate, purplish black. 



Seeds thick, rounded at both ends S. sandwicense 



Seeds thin flat, beaked at both ends S. rhynchospermum 



Flowers single and sessile. 



Fruits globose citron or orange yellow. 



Seeds as in S. sandwicense but smaller S. auahiense 



Flowers 2 to 3, pedicellate. 



Fruits conical, brownish yellow. 



Seeds small, linear-elongate, dull S. spathulatum 



Flowers single, pedicellate. 



Fruits large conical, grayish-white. 



Seeds elliptical elongate, dull; radicle long, protruding S. Ceresolii 



Sideroxylon sandwicense (Gray) Benth. & Hook. 



Alaa or Aulu, Kaulu according to Hillebrand. 



(Plate 153.) 



SIDEROXYLON SANDWICENSE (Gray) Benth. & Hook. Gen. PI. II. (1876) 655; 

 Hbd. Fl. Haw. Isl. (1888)) 276; Engi. in Engl. et Prantl Pflzfam. IV. I. (1890) 

 144. fig. 77, L (Sect. VIII., in Nachtr. Sect. IX.); Del Cast. 111. Fl. Ins. Mar. 

 Pao. VII. (1892) 288. Sapota Sandwicensis A. Gray in Proc. Am. Ac. V. (1862) 

 328; H. Mann Prqc. Am. Ac. VII. (1867) 188; Wawra in Flora (1875) Ad- 

 denda 252. 



Leaves coriaceous, obovate-oblong, on petioles of 2.5 to 3.5 cm, equally rounded at 

 both ends, or contracted at the base, quite entire, old leaves glabrous on both faces, often 

 clothed with a brownish pubescence underneath, shining above, veins prominent straight 



383 



