Ramaley : SEEDLINGS OF CERTAIN WOODY PLANTS. 73 



first about 12-15 mm - l n g an d 2 5 rnm. broad. Eventuall}' 

 they may become 20 mm. long and 30 mm. broad with petioles 

 10 mm. in length. In shape they are often quite asymmetrical. 

 The foliage leaves are opposite, ovate, pointed, entire. The 

 first do not differ materially from the later ones. The epicotyl 

 is about the same length as the hypocotyl. 



Butneria fertilis (WALT.) KEARNEY. 



The seedling of this plant does not differ in any important 

 respect from that of the species just described. 



CAESALPINACE^E. 



Parkinsonia aculeata LINN. 



The seeds of this shrub germinate in about two weeks after 

 planting. The seed coat is usually carried up. 



When they first appear the cotyledons are 15 mm. long, 8 

 mm. broad, ovate-elliptical, sessile, very slightly auriculate at 

 base. The hypocotyl is stout, 30-50 mm. in length. The coty- 

 ledons increase in size until they are 25 mm. long. 



Foliage leaves are alternate ; all are pinnate, the first has five 

 pairs, the second six pairs of leaflets. The epicotyl is 9 mm. 

 long when two leaves have appeared. 



Cercis canadensis LINN. 



This is the well-known " red bud " or "Judas tree " of the 

 central United States. The seeds germinate in about two 

 weeks. The seed coat is usually carried up, holding the coty- 

 ledons together until erect. The veins of the cotyledons are 

 distinct even before the cotyledons have separated. 



The cotyledons are broadly ovate, at first 6 mm. long and 4 

 mm. broad, eventually 15 mm. long and 8 mm. broad. The 

 hypocotyl is stout, 10-30 mm. long. This is of interest since 

 the hypocotyl of C. siliquastrum WILLD., as described by Lub- 

 bock,* is but 5-6 mm. in length. 



The epicotyl is 20-30 mm. long. Foliage leaves are all al- 

 ternate, entire, cordate, long-petioled. 



Gleditsia triacanthos LINN. 



The " honey locust," as this plant is called, is a familiar tree 

 of the central United States. The seeds germinate in about one 



* Op. cit. i : 465. 



