BROOKLYN BOTANIC GARDEN 
LEAFLETS 
Series VIII Brooklyn, N. Y., October 6, 1920. No. 10. 
FAMILIES OF USEFUL PLANTS 
The study of plant forms and of plant families is usually 
illustrated from the local floras. It may be extended in an inter- 
esting way by means of economic plants, which exhibit almost 
every type of structure. The following list includes some of the 
principal useful plants, except timber trees. A few less important 
ones often seen or of some special interest are added. The 
names are in most cases from Bailey’s Cyclopedia of Horti- 
culture. 
APETALOUS DICOTYLEDONS 
Walnut Family. Pecan ( Carya Pecan); English Walnut 
(Juglans regia); Black W. (/. nigra); White W. or Butternut (/. 
cinerea ) . 
Birch Family. Hazelnut (Corylus sp.) 
Beech Family. Chestnut ( Castanea sp.); CorkOak ( Quercus 
Saber) . 
Mulberry Family. Fig ( Ficus Carica); Breadfruit ( Artocar - 
pus incisa); Hop (Humulus Lupulus); Hemp ( Cannabis sativa); 
Mulberry (Morns sp.); West Indian Rubber Tree (Castilla 
elastica ) . 
Buckwheat Family. Buckwheat (Fagopyrum escnlentnm); 
Rhubarb (Rheum Rhaponticum) . 
Pepper Family. Black, and White, Pepper (Piper nigrum ) . 
Pigweed Family. Beet (Beta vulgaris) and its varieties, Swiss 
Chard and Sugar Beet; Spinach (Spinacea oleracea). 
Carpetweed Family. New Zealand Spinach ( Tetragonia ex- 
pansa) . 
POLYPETALOUS DICOTYLEDONS 
Custard Apple Family. Custard Apple, Sweet-sop, Sour- 
sop, Cherimoya (Anona sps.) 
Nutmeg Family. Nutmeg (Myristica fragrans). 
Laurel Family. Camphor (Cinnamomum Camphora); Cinna- 
mon (Cinnamomum zeylanicum); Avocado Pear (Persea gratis- 
sima); Laurel (Laurus nobilis ) . 
Poppy Family. Poppy (Pap aver somniferum). 
