1» JOURNAL OF THE ARNOLD ARBORETUM (vol. v 



Vitis cinerea Engelm. This winter grape is found in the valley, growing 

 in thickets along the creek, and also in open situations on the north side 

 of the mountain. 



Vitis cordifolia Michx. Occasionally found in the valley, where it is a 

 high climber in trees, and more abundantly about the margins of rock 



slides, on the north slopes of the mountain. In the latter situations it is 



usually prostrate upon the rocks. 



Vitis Linsecomii var. glauca Munson. This Southwestern species 

 grows on rocky banks and in dry open woods on the mountain slopes. 

 It can easily be recognized by its large firm leaves, purple-glaucous branch- 

 lets and depressed-globose berries, about a centimeter in diameter. 



Parthenocissus quinquefolia var. hirsuta Planch. This pubescent form 

 of the Virginia Creeper is frequent in the valley and occasionally found at 

 higher levels. It is a stout climber on trees and sometimes on rocky 



bluffs. 



THYMELAEACEAE 



Dirca palustris L. This curious northern shrub, commonly known as 

 Leatherwood, from its tough supple branches, was found along a little 

 north-facing bluff of Big Creek. 



GUTTIFERAE 



Ascyrum stans Michx. This slender shrub is found rarely in sandy 

 boggy ground and on moist banks in the valley. 



Ascyrum hypcricoides L. The little St. Andrew's-cross grows abund- 

 antly in dry rocky ground, especially on the south slopes. 



Hypericum prolificum L. This tall shrubby species of St. John's-wort 

 is quite common in places along the rocky margins of Big Creek, and is 

 also abundant in open ground on top of the mountains. 



Hypericum oklahomense, sp. nov. 1 



Stems erect or spreading, diffusely branched above, the young branch- 

 lets slightly ancipital, leaves narrowly lanceolate or obovate, principal ones 

 5 to 10 mm. wide, 4 to 6 em. long, abruptly pointed at apex, gradually taper- 

 ing into a petiole-like base, distinctly finely punctate on the upper surface, 

 of firm texture, with revolute margins, often with conspicuous fascicles 

 of small leaves at their bases; bracts of inflorescence ovate or short oblong, 

 broad-based; capsules narrowly ovoid or subulate, 12 to 15 mm. long,' 

 including the beak, which is often fully half as long as the body, 2 to 3.5 



1 Hypericum okiahomense, sp. nov. 



Frutex erectus, 0.5-2 m. altus, internum minor, raini.s subteretibus cinereo-brunneu 

 ramulisque andpitibus; folia ramulorura anguste obovata vel lanceolata, abrupte acuta, 

 basin versus sensim attenuata. superne punctata, margine involuta, 4-6 cm. longa, 5-10 mm! 

 lata, saepe foliis fasciculatis multo minoribus in axillis; cyma terminali.s composite dicho- 



toma. subfoliosa. sparsiflora; capsula anguste ovoidea vel cylindrica, 5-locularis et manifeste 

 5-lobata. rostro incluso 12-15 mm. longa, 2-3.5 mm. lata, in rostrum longum attenuata; 

 Hores ignoti. 



