CACTACEAE. 257 



Cactus Melocactus'L., Turk's Cap, Jamaican, a globose cactus a foot or 

 more in diameter with numerous strongly spiny ribs, and a woolly top bearing 

 small pink or rose flowers and narrowly pyriform pink fruits, is mentioned by 

 Eeade and by Lefroy as commonly grown prior to 1879, and is now occasionally 

 seen. [Melocactus communis DC] 



Pereskia grandifolia Haw., Bush Pereskia, South American, a s-piny shrub 

 with oval or oblong, smooth entire leaves and terminal clusters of rose- 

 colored or purple flowers, is occasional in gardens, planted for ornament. The 

 genus Pereskia differs from other Cacti in having normal leaves. [P. Bleo 

 of Reade and of Lefroy.] 



Pereskia Pereskia (L.) Karsten, Barbadoes Gooseberry, tropical 

 American, a high-climbing spiny vine, with similar leaves to those of the 

 preceding species, but smaller, and large clusters of white or cream-colored 

 fragrant flowers, followed by leafy edible yellowish berries, is also occasionally 

 planted for ornament. \^Cactus Pereskia L. ; P. aculeata Mill.) 



Zygocactus truncatus (Haw.) Schumann, Crab Cactus, Brazilian, grown 

 in greenhouses, is spineless, about 1° long, with flat jointed stems V-V broad, 

 the thin, oblong joints l-i'-2' long, united only through the middle, bearing 

 2 or 3 ascending, prominent teeth on both margins; the red to rose-colored, 

 irregular flowers are about 3' long. [Epiphyllum truncatum Haw.] 



The following cacti were sent to Paget Rectory from the New York 

 Botanical Garden in 1914. 



Cereus lepidotiis Salm-Dyck, Venezuelan. 



Nyctocereus serpentinus (Lag. & Rodr.) Britton & Rose, Mexican. 



Acanthocereus pentagonus (L.) Britton & Rose, Tropical American. 



Cephalocereus leucocephalus (Poselg.) Britton & Rose, Mexican. 



Cephalocereiis Brooksianus Britton & Rose, Cuban. 



Lemaireocereus griseus (Haw.) Britton & Rose, South American. 



Lemaireocereus Hystrix (Salm-Dyck) Britton k Rose, West Indian. 



Harrisia portoricensis Britton, Porto Rican. 



Harrisia gracilis (Mill.) Britton, Jamaican. 



Harrisia eriophora (Pfeiff.) Britton, Cuban. 



Echinocereus enneacanthus Engelm., Texan. 



EcJiinocactus pemviamos Schumann, Peruvian. 



Mamillaria nivosa Link, West Indian. 



Order 26. MYRTALES. 



Herbs, shrubs or trees, unarmed, sometimes aquatic or amphibious. 



Leaves alternate or opposite. Flowers regailar or irregular, complete, and 



often showy, or reduced to a stamen and pistil adnate to the hypanthium. 



Hypanthium merely enclosing the ovary or adnate to it. Stamens few or 



many. Anthers opening by slits or pores. Stigma terminating the style, 



or sessile. Fruit capsular or baccate, or resembling an achene. 



Style present, simple or compound ; stigma terminal. 



Anthers opening by pores. Fam. 1. Mki.astomaceae. 



Antliers opening by longitudinal valves. 



Hypanthium merely enclosing the ovary. Fam. 2. I.vthb.vceae. 



Hypanthium adnate to the ovary or mainly so. 

 Cotvledons spirally convolute in the embryo, 

 bvarv several-celled ; ovules numerous, not 



pendulous. Fam. 8. Pimcaceae. 



Ovary 1-celled ; ovules 2-5. pendulous. Fam. 4. 1>;rminai.i.\ceae. 



Cotyledons not spirally convolute. 



Sepals imbricated or united and the calyx _ 



falling away as a cap. Fam. ... Mvrtaceae. 



18 



