52 The Ohio Naturalist. [Vol. VII, No. 3, 



leaf. On the hairs of Solanum carohnense there are usually four 

 spreading points and a single erect one, but the number of points 

 on the other Solanums, the Crotons and on Lepargyraea vary 

 grcatlv. On these plants we find the more typical forms of true 

 stellate hairs. 



The second type of stellate pubescence is shown in the figures 

 of Hicoria minima (Figs. 11, 12) Helianthemum canadense (Figs. 

 22, 23) and Viburnum alnifolium (Figs. 25, 26). In these the 

 single hairs are arranged from a common point on the surface and 

 spread in many directions. Hairs arranged in this manner are 

 called stellate tufts. 



The hairs of Hicoria minima are rather heavy, and there are 

 very seldom more than four in the tuft. A great many of the 

 tufts have only two hairs. The single hairs of the Helianthe- 

 mum are barbed and a little more slender than those of the 

 hickory. The number of hairs in a tuft varies but tufts made 

 up of from six to fifteen are the most comnion. The single hairs 

 of Viburnum alnifolium are very long and slender, and being 

 very much twisted and intertwined give a true tomentose cov- 

 ering to the leaf. The number of hairs in a tuft varies, but most 

 frequently there are from ten to twenty. 



The Lepargyraea has peltate scales along with the stellate 

 hairs. In fact the transition is very gradual, and there are some 

 intermediate forms which could be placed either with the scales 

 or the hairs. Usually though they fall into three rather distinct 

 divisions: the brown scale (Fig. 1), the white scale (Fig. 2), and 

 and the white stellate hair (Fig. 3). The stellate hairs of Hicoria 

 minima and other species are also found associated with scales 

 (Figs. 8, 9, 10), but the scales are entirely different from those of 

 Lepargyraea. There is also a sharp distinction between the 

 hairs and the scales of the hickory, no transition forms being pres- 

 ent. The scales of Hicoria minima are rather large, yellowish 

 green or brown in color and attached to the leaf by a very short 

 stalk. Those of Hicoria alba are smaller and brown in color, and 

 those of Chamaedaphne calyculata are also of the same type. 

 They are of a typical peltate shape and are multicellular. 



Ohio Plants Which Have Stellate Pubescence. 



Juglans cinerea L., leaves stellate tufted. 



Hicoria ovata (Mill.) Britt., twigs stellate tufted, leaves 

 finely stellate tufted. 



Hicoria laciniosa (Mx.f.) Sarg., leaves stellate tufted. 



Hicoria glabra (Mill.) Britt., leaves stellate tufted, only 

 slightly above. 



Hicoria alba (L.) Britt., twigs stellate tufted, leaves tomen- 

 tose-stellate tufted. 



