Part 3, 1911 J RUTACEAE 209 



Leaflets usually densely and permanently tomentose beneath. 1. P. lomenlosa. 



Leaflets glabrous or with few scattered hairs beneath. 



Leaflets commonly of an ovate type, often acuminate at the apex, 3.5-10 cm. 



long, 1.5-5.5 cm. broad. 2. P. tri/oliata. 



Leaflets lanceolate to oval or obovate, rounded, acute or somewhat acuminate, 



1.5-6 cm. long, 0.7-2.8 cm. broad. 3. P. Baldwinii. 



1. Ptelea tomentosa Raf. Fl. Ludov. 108. 1817. 



? Ptelea podocarpa DC. Prodr. 2 : 83. 1825. 



Ptelea ti ifoliata mollis T. & G. Fl. N. Am. 1 : 680. 1840. 



Ptelea mollis M. A. Curt. Am. Jour. Sci. II. 7: 406. 1849. 



Ptelea rhombifolia Heller, Bull. Torrev Club 26 : 313. 1899. 



Ptelea prominula, /'. Wrightiana Greene, Contr. U. S. Nat. Herb. 10: 58. 1906. 



Ptelea anlonina Greene, Contr. U. S. Nat. Herb. 10 : 59. 1906. 



Ptelea villosula, P. lortuosa Greene, Contr. U. S. Nat. Herb. 10: 60. 1906. 



Ptelea subintegra Greene, Contr. U. S. Nat. Herb. 10 : 61. 1906. 



Ptelea sancta Greene, Contr. TJ. S. Nat. Herb. 10 : 63. 1906. 



Ptelea parvula, P. monticola Greene, Contr. V. S. Nat. Herb. 10: 64. 1906. 



Ptelea polyadenia Greene, Contr. U. S. Nat. Herb. 10: 65. 1906. 



Ptelea subveslita, P. padifolia Greene, Contr. U. S. Nat. Herb. 10: 67. 1906. 



Ptelea verrucosa Greene, Contr. U. S. Nat. Herb. 10 : 69. 1906. 



A shrub or small tree with the petioles and under surface of the leaflets usually clothed 

 with a dense, persistent tornentum ; leaflets elliptic to nearly oval or sometimes obovate, 

 2.5-8 cm. long, 1-5 cm. broad, obtuse, acute, or short-acuminate at the apex, inequi- 

 laterally cuneate or rounded at the base, the terminal one lanceolate to broadly ovate or 

 obovate; staininate flowers 0.7-1.2 cm. broad, the petals oblong to elliptic or somewhat 

 obovate, 4-5 mm. long, 2-3 mm. broad, the filaments hirsutulous to the middle or a little 

 above; samaras 1.3-2.4 cm. long, broadly elliptic to oval, cordate or truncate at the base, 

 notched or subulate-tipped by the prolongation of the wing along the style ; the body elliptic 

 to oval or somewhat obovate, more or less strongly reticulate. 



Type locality : Louisiana. 



Distribution : North Carolina to Georgia, Arizona, and Durango. 



Note. Ptelea serrata Small, Bull. Torrey Club 28: 292 (1901), and Ptelea Toxicodendron 

 Small, Bull. Torrey Club 28 : 294 (1901), appear to be nearly glabrous forms of this species. 



2. Ptelea trifoliata L. Sp. PI. 118. 1753. 



Ptelea pentaphvlla Fabr. Enum. PI. Helm. 416. 1759. 



Ptelea vitictfolia Salisb. Prodr. 68. 1796. 



Ptelea trifoliata pentaphylla Miinchh. (Hausv. 3 : 242?); Du Roi, Harbk. Baumz. ed. 2. 2 : 302. 1800. 



Ptelea trifoliata pubescens Pursh, Fl. Am. Sept. 107. 1814. 



Ptelea pentandra Moc. & Sesse ; DC. Prodr. 2 : 83. 1825. 



Ptelea trifoliata heterophylla Dippel, Handb. Laubh. 2: 354. 1892. 



Ptelea m'icrocarpa Small, "Bull. Torrev Club. 28: 293. 1901. 



Ptelea Carolina Greene, Torreya 5 : 99. 1905. 



Ptelea obcordata Greene, Torreya 5 : 99. 1905. 



Ptelea mesochora Greene, Torreva 5 : 100. 1905. 



Ptelea aquilina Greene, Contr. U. S. Nat. Herb. 10: 57. 1906. 



Ptelea isophylla Greene, Contr. U. S. Nat. Herb. 10: 58. 1906. 



Ptelea formosa Greene, Contr. U. S. Nat. Herb. 10 : 59. 1906. 



Ptelea megacarpa Rose ; Greene, Contr. U. S. Nat. Herb. 10 : 68. 1906. 



A shrub or small tree, sometimes attaining a height of 7 or 8 m., with grayish bark, 

 the young twigs glabrous or pubescent; lateral leaflets sessile or subsessile, inequilateral, 

 elliptic to ovate, oval, or oblong-lanceolate, sometimes oblanceolate or somewhat obovate, 

 3.5-10 cm. long, 1.5-5.5 cm. broad, acuminate, acute or rounded at the apex, obliquely 

 cuneate or rounded at the base, the terminal leaflet generally larger and more gradually 

 contracted at the base; all rather dark -green and lustrous above, paler beneath, entire, 

 undulate or finely serrate, when young glabrous or covered with a short close pubescence, 

 usually disappearing with age ; branches of the inflorescence and the pedicels usually loosely 

 pubescent; flowers 0.8-1.2 cm. broad, the sepals narrowly to broadly ovate, occasionally 

 oblong or lanceolate, 1-2 mm. long, finely pubescent or quite glabrous; petals nearly 

 oblong, elliptic or sometimes oblanceolate, 4.5-6.5 mm. long, finely pubescent, rounded or 

 somewhat acute at the apex ; filaments hirsutulous mostly below the middle, the anthers 

 ovate ; samaras 1.5-2.8 cm. broad, suborbicular, oval or obovate, wings rounded, refuse or 

 subulate-tipped, the body oblong to oval or obovate, 5-6 mm. broad. 



Type locality : Virginia. 



