338 IOWA ACADEMY OF SCIENCE Vol. XXV, 191>s 



iodons 4I/2 to 5 mm. wide by 30 mm. long, narrowly elliptical, 

 fleshy, entire, green above and below, stem purplish below, angu- 

 lar. Leaves opposite, obovate, penninerved, margin serrate bear- 

 ing numerous small triehomes. Leaves smooth above, veins 

 prominent below. Hairs short, straight or curved, pointed, with 

 a broad base, walls relatively thin, longitudinally roughened. 

 The seeds of this ash were germinating freely out of doors the 

 early part of INIay. 



BIGNONIA. 



Lubbock^^ has described Catalpa Kaempferi, C. syringaefolia 

 and C. speciosa. 



Catalpa speciosa Warder. Seedling examined July 11, 1917. 

 Germination hypoggeous; cotyledons oblate, deeply bifid, with 

 rounded lobes, surface paler in color than upper surface ; hypo- 

 cotyl slightly hairy, with long slender reddish triehomes. Peti- 

 ole of cotyledon with short hairs on upper surface. Stem above 

 the cotyledons reddish, slightly hairy. First pair of leaves 

 opposite, prominently veined, under surface paler than upper 

 surface, both surfaces smooth. Third pair of leaves similar, 

 margins when young, as well as midvein, slightly pubescent. 

 Tap root straight, prominent joint where radicle begins, roots 

 long and slender. 



■*A contribution to our knowledge of seedlings, 2, p. 335. Le Maout and 

 Decaisne, 602 f. 



