Some New Forms from the Middle West 



Norman C. Fassett 



Napaea dioica L., f. stellata, n.f., foliorum setis stellatis, ramis 

 0.2-0.5 mm. longis, rare simplicis 1.0 mm. longis. — Along a rail- 

 road 3.8 miles west of Cross Plains, Wisconsin, August 16, 1942, 

 N. C. Fassett, no. 22057 (Type in Herb. Univ. of Wis.). 



N. dioica occurs with two quite distinct types of pubescence. In 

 some plants the lower leaf-surfaces have straight appressed simple 

 hairs a millimeter long, with only occasionally a stellate trichome. 

 In others these simple hairs are nearly or quite lacking except on the 

 larger veins, and are replaced by close stellate hairs with short 

 branches. The first type is represented in the Herbarium of the 

 New York Botanical Garden by a sheet from Pennsylvania, one 

 each from Cincinnati and Peoria, and by two cultivated plants. 

 The second is represented by collections from Ohio, Indiana, Illi- 

 nois, Wisconsin and Iowa. In the Herbarium of the University of 

 Wisconsin there are from this state 3 sheets with simple pubescence, 

 and 17 with stellate trichomes predominating. It is therefore evi- 

 dent that both forms occur in the Middle West (where, despite 



Leaf of Napaea dioica, X%. 

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