444 



RUTACEAE. 



VOL. II. 



About 150 species, natives of temperate and tropical regions. In addition to the following 2 

 others occur in the Southern States. Type species : Zanthoxylum Clava-Herculis L. 



Flowers in small sessile axillary cymes ; calyx none. 

 Flowers in large terminal compound cymes ; calyx present. 



1. Z. americanum, 



2. Z, Clava-Herculis. 



i. Zanthoxylum americanum Mill. 



Prickly Ash. Toothache-tree. 



Fig. 2691. 



Xanthoxylum americanum Mill. Card. Diet. 

 Ed. 8, no. 2. 1768. 



A shrub, or small tree, reaching a maxi- 

 mum height of about 25, and a trunk 

 diameter of 6'. Leaves alternate, odd- 

 pinnate, pubescent when young, becoming 

 glabrous or nearly so when old; leaflets 

 3-11, ovate, opposite, dark green above, 

 lighter beneath, nearly sessile, 1^-2' long, 

 crenulate or entire, acutish ; flowers green- 

 ish, about ii" broad, in sessile axillary 

 cymes, borne on the wood of the previous 

 season and appearing before the leaves; 

 pedicels slender; calyx none; petals 4 or 5; 

 pistils 2-5; follicles black, ellipsoid, about 

 2" long, on short stipes, i-2-seeded. 



In woods and thickets, Quebec to Virginia, 

 especially along the mountains, west to western 

 Ontario, South Dakota, Kansas and Nebraska. 

 Wood soft, light brown ; weight per cubic foot 

 35 Ibs. Angelica-tree. Suterberry. April-May. 



2. Zanthoxylum Clava-Herculis L. 



Southern Prickly Ash. Sea Ash. 

 Pepper-wood. Fig. 2692. 



Z. Clava-Herculis L. Sp. PI. 270. 1753. 



Z. carolinianum Lam. Encycl. 2 : 39. 1 786. 



A small, very prickly tree, with a maxi- 

 mum, height of 45 and trunk diameter of 

 9', the prickles supported on cushions of 

 cork sometimes 8' broad. Leaves alternate., 

 odd-pinnate, glabrous, shining above, dull 

 beneath ; leaflets 5-19, obliquely ovate, 

 nearly sessile, i4'~3' long, acute, crenulate; 

 flowers greenish-white, in large terminal 

 cymes, appearing before the leaves ; sepals 

 4 .or 5; petals 4 or 5; pistils 2 or 3; fol- 

 licles about 2" long, sessile. 



Along streams, coast of southern Virginia to 

 Florida, west to Texas and Arkansas. Wood 

 light brown; weight per cubic foot 31 Ibs. 

 Hercules'-club. Prickly-yellowwood. Yellow 

 prickly ash. Wild orange. June. 



2. PTELEA L. Sp. PI. 118. 1753. 



Shrubs or small trees, without prickles, the bark bitter. Leaves 3-5-foliolate, with entire 

 or serrulate leaflets. Flowers greenish white, polygamous, corymbose-paniculate. Calyx 

 4~5-parted, the lobes imbricated. Petals 4 or 5, much longer than the calyx, also imbricated. 

 Stamens 4 or 5, alternate with the petals; filaments hairy on the inner side, present in the 

 pistillate flowers but the anthers abortive or wanting. Ovary flattened, 2-celled (rarely 

 3-celled). Fruit a -nearly orbicular samara, 2-winged (rarely 3-winged). indehiscent. Cells 

 i-seeded. Seed oblong-ovoid. [Greek, Elm, from the similarity of the fruits.l 



Three species, natives ot the United States and Mexico, the following typical. 



