276 



The; cactacbae. 



On page 116, vol. 11, under Machaerocereus eruca, add to illustrations: Journ. Intern. 

 Gard. Club 3: 641 ; Karsten and Schenck, Vegetationsbilder 13: pi. 16, as Cereus eruca. 



-49 — Dendrocereus nudiflorus. 



On page 117, vol. 11, under Machaerocereus gummosus, add to illustrations: Cact. 

 Journ. 2: 107, as Cereus gummosus; Zeitschr. Ges. Krdk. 1916: f. 6, in part; Karsten and 

 Schenck, Vegetationsbilder 13: pi. 17, f. a. 



On page 119, vol. 11, under Nyctocereus serpentinus, add to illustrations: Watson, 

 Cact. Cult. 67. f. 16; ed. 3. f. 12, as Cereus serpentinus. 



On page 119, vol. 11, under Nyctocereus guatemalensis , add to illustrations : Monatsschr. 

 Kakteenk. 31 : 41, as Cereus hirschtianus. 



On page 123, vol. 11, under Acanthocereus pentagonus, add to illustrations: De Laet, 

 Cat. Gen. f. 32, as Cereus haxaniensis; Monatsschr. Kakteenk. 32: 21, as C. princeps. 



On page 125, vol. ii, insert the following: 

 3 a. Acanthocereus floridanus Small, sp. nov. 



Stems and branches diffusely spreading or reclining, 3 to 10 meters long, stout: joints promi- 

 nently 3 to 5-angled, but mostly 3-angled, dark green, often forming impenetrable thickets : areoles 

 remote, with mostly 4 to 7 slender or subulate spines, the central one often i to 2 cm. long: ovary 

 stout-trumpet-shaped, 8 to 10 cm. long, with few large, separated tubercled areoles at the base, 

 bearing mostly 3 to 5 diverging spines, those on the upper part usually with one spine each; outer 

 perianth-segments deltoid to triangular-lanceolate or lanceolate-subulate and almost linear, the 

 longer ones 3.5 to 4 cm. long, acuminate; inner perianth-segments broadly linear, 3.5 to 4.5 cm. 

 long, about six times as long as wide, broadly acuminate; filaments adnate more than halfway up 

 from the base of the hypanthium; anthers less than 2.5 mm. long. 



Hammocks, along or near the coast, southern peninsular Florida, adjacent islands, 

 and Florida Keys. Type collected by J. K. Small, on Key Largo, December 191 7 and 

 1918; preserved in the herbarium of the New York Botanical Garden. 



This Florida plant has been referred by us to A. pentagonus, but specimens recently 

 collected by Dr. Small, including good flowers, which we had not seen before, indicate it 

 to be a distinct species, characterized by its much shorter perianth and more spiny ovary. 



Illustrations: Britton and Rose, Cactaceae 2: 123. f. 182; 124. f. 184, as Acanthocereus 



On page 129, vol. 11, under Heliocereus speciostis, add to the illustrations: Herb. 

 Gener. Amat. 4: pi. 244; Colla, Hort. Ripul. pi. 10; Bonpl. Descr. PI. Rar. pi. 3, as Cactus 



