98 American Midland Naturalist Monograph No. 7 



mon; known from Alexander, Franklin, Johnson, Massac, Pope, and 

 Pulaski counties. Aug.-Oct. 



33. Saururaceae Lindl. — Lizard-tail Family 



1. Saururus L. — Lizard-tail 

 S. cernuus L. Wet grovmd in woods, or on muddy shores, locally 

 abundant; extending northward to Henderson, Peoria, and Ver- 

 milion counties. June-Sept. 



34. Rutaceae Juss. — Rue FaiTiily 



1. Leaves pinnate; branches often prickly; fruit of 1-5 two-\alved follicles 

 1. Zanthoxylum 



1. Leaves trifoliate; branches not prickly; fruit a 2-seeded, suborbicular 

 samara 2. Ptelea 



1. Zanthoxylum L. — Prickly-ash 

 Z. americanum Mill. Woods and thickets, common in the northern 

 half of 111. Apr.-May. 



2. Ptelea L. — Wafer-ash. Hop-tree 

 P. trifoliata L. Along streams and at the edges of woods, not 

 uncommon. May-July. 



35. Simarubaceae Lindl. — Quassia Family 



1 . Ailanthus Desf . — Tree of Heaven 



A. altissima (Mill.) Swingle. Waste ground and edges of woods, 

 common; native of China. Jime-July. [A. glandulosa Desf.]. 



36. Geraniaceae J.St.Hil. — Geranium Family 



1. Leaves palmately veined and lobed or divided; antheriferous stamens 10, 

 rarely 5 1. Geranium 



1. Leaves pinnately veined and dissected; antheriferous stamens only 5 



2. Er odium 



1 . Geranium L. — Cranesbill. Wild Geranium 

 1 . Plants perennial with a stout caudex. 



2. Petals 14-22 mm long, purple, sometimes white, the flowers 2.5- 

 3.5 cm in diameter; stem-leaves 2; style colunin 2.5-3.5 cm 

 long; moist woods, and along roads, common throughout 111. 



May-June G. maculatum L. 



2. Petals less than 1 cm long, whitish or pink, the flowers 6-8 mm 

 in diameter; stem-leaves several; stems weak, diffusely 

 branched; waste places, occasional; adv. from Asia; Ogle Co., 

 Bebb: Champaign Co., Gleason in 1898; Winnebago Co., 



E. W. & G. B. Ffll in 1947. Siberian Cranesbill ' 



G. sibiricum L. 



1. Plants annual or biennial; petals 2-10 mm long. 



