The Cactaceae : descriptions and illustrations of plants of the cactus family . Fig. 262.—Ovary of Hylocereus costaricensis transformed into branch. Type locality: Costa Rica. Distribution: Costa Rica. This species was originally described as a variety of Cereus trigonus, but it has muchstouter blue stems and is otherwise different. It grows well in cultivation and frequentlvflowers. The very young areoles on the stem produce an abundance of nectar which runsdown the stem in large sticky drops,reduced leaves from the lower areoles. Figure 262 represents an arrested flower transformed in


The Cactaceae : descriptions and illustrations of plants of the cactus family . Fig. 262.—Ovary of Hylocereus costaricensis transformed into branch. Type locality: Costa Rica. Distribution: Costa Rica. This species was originally described as a variety of Cereus trigonus, but it has muchstouter blue stems and is otherwise different. It grows well in cultivation and frequentlvflowers. The very young areoles on the stem produce an abundance of nectar which runsdown the stem in large sticky drops,reduced leaves from the lower areoles. Figure 262 represents an arrested flower transformed into a branch showing scales or BRITTON AND ROSE, VOL. II PLATE XXVIII. ; J j M. E Eaton del. Flower and end of branch of Hyloccrcus ocamponis. X HYLOCEREUS. 187 7. Hylocereus undatus (Haworth) Britton and Rose in Britton, Flora Bermuda 256. 1918. (tutus triangularis aphyllus Jacquin, Stirp. Amer. 152. [763. Cereus triangularis major De Candolle, Prodr. 3: 468. 1828. Cereus undatus Haworth, Phil, Mag. 7: no. 1830. Cereus trice-status Gosselin, Bull. Soc. Bot. France 54: 664. 1907. Hylocereus tricostalus Britton and Rose, Contr. U. S. Nat. Herb. 12: 429. 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 hornv in age; areoles 3 to 4 ; spines 1 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 man


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