HYLOCUREUS. 



187 



> 



jreus undatus (Haworth) Britton and Rose in Britton, Flora : 



Cactus triangularis aphyllus Jacquin, Stirp. Amcr. 152. 1763. 



Cereus triangularis major De Candolle, Prodr. 3: 468. 1828. 



Cereus undatus Haworth, Phil. Mag. 7: no. 1830. 



Cereus tricostatus GosseUn, Bull. Sck!. Bot. France 54: 664. 1907. 



Hylocereus tricostatus Britton and Rose, Contr. U. S. Nat. Herb. 12: 429. 



1918. 



1909. 



Stem long, clambering over bushes and trees or creeping up the sides of walls; ribs mostly 3, 

 broad, thin, green; margin usually strongly undulate, more or less horny in age; areoles 3 to 4 cm. 

 apart; spines i to 3, small, 2 to 4 mm. long; flowers up to 29 cm. long or more; outer perianth-seg- 

 ments yellowish green, all turned back, some strongly reflexed; inner perianth-segments pure white, 

 erect, broad, oblanceolate, entire, with apiculate tips; filaments slender, cream-colored; stigma- 

 lobes as many as 24, slender, entire, cream-colored; style, stout, 7 to 8 mm. in diameter, cream- 

 colored; fruit oblong, 10 to 12 cm. in diameter, red, covered with large foUaceous scales, or nearly 

 smooth when mature, edible; seeds black. 



Type locality: China, evidently in cultivation. 



Distribution: Common throughout the tropics anci subtropics; often found as an escape 

 and widely cultivated. 



This species has long been known in cultivation under the name of Cereus triangularis, 

 and it is to be regretted that the name triangularis can not be retained, but the plant \vhich 

 Linnaeus described as Cactus triangularis came 

 from Jamaica. The latter is now well known 

 to botanists but it has never been much culti- 

 vated, while H. undatus is grown all over the 

 world and grows half -wild in all tropical coun- 

 tries. It is the best known of all the night- 

 blooming C( 



flowers. 



makes 



Honolulu there is a hedge about Punahou 



mile 



000 



from p 

 similar 



Cereus undatus was described by Haworth 

 plants sent from China; he says it is 



but twice as large. 



made 



C. triangularis, which Schumann referred 

 doubtfully to C. napoleonis. 



In the New York Botanical Garden herb- 

 arium are specimens of a Hylocereus collected 

 on Martinique in 1884 by Pere Duss (No. 

 904) , which have the homy-margined ribs and 

 large white flowers of this species. From this 

 island Jacquin in 1763 described a variety 

 aphyllus of Cactus triangularis from the moun- 

 tain forests, which may very likely be this 



which case Martinique may 



home 



forms 



Fig. 263. — Hylocereus undatus. 



One is called chacoub ; it has white 



sgments 

 form c£ 



and reddish purple. The other 



creamy-white fruit ; these fruits are considered among tne most aesirauie 1 



often to be found in the markets for sale. 



Illustrations: Safford, Ann. Rep.- Smiths. Inst. 1908: pi. 6, f. i, a 

 status: Martius. Fl. Bras. 4':?!- 42; Engler and Prantl, Pflanzenfam 



Hylocereus 



