16 JOURNAL OF THE ARNOLD ARBORETUM [vol. iv. 



also found Juniperus virginiana L., Pinus taeda L., Ulmus alata Michx., 



Celtis laevigata var. texana Sarg., Morns rubra L., Ostrya virginiana K. 

 Koch, Diospyros virginiana L., Bumelia lanuginosa Pers., Fraxinus ameri- 

 cana L., Rhamnus caroliniana Walt, and Viburnum rufidulum Raf. Grow- 

 ing usually lower down on the protected slopes are Arundinaria tecta 

 Michx., Sassafras officinale Nees & Eberm., Carpinus caroliniana Walt., 

 Liquidambar Styraciflua L., Nyssa sylvatica Marsh., Cornus racemosa Raf., 

 Ilex decidua Walt., /. caroliniana Trel., Ilamamelis macrophylla Pursh, 

 Cercis canadensis L., Robinia Pseudoacacia L., Tilia floridana Small, 

 Acer saccharum var. glaucum Sarg. and Fraxinus quadrangulata Michx. 

 Of the speceis enumerated above Ilex caroliniana is apparently rare and 

 local, not having been noted elsewhere in the vicinity, although it might 

 probably be found in similar situations. Hamamelis macrophylla is also 

 comparatively rare here, but is found more abundantly along small sandy 

 creeks in the vicinity. Robinia Pseudoacacia is rather abundant and is 

 certainly native here, although beyond the range usually assigned to it. 

 Of Fraxinus quadrangulata there are a number of medium sized trees 

 growing well down towards the base of the bluff. So far as I know 

 this station is the farthest southwest at which it has been found. 



A large number of herbaceous plants, some of them apparently quite 

 local, are growing along the bluff, and there is the same curious mingling 

 of northern and southern forms amongst them as in the ligneous species. 

 On the dry ridges and in the deep ravines in the immediate vicinity of this 

 bluff are the type localities of Prunus mexicana var. julionensis Sarg., a 

 quite distinct variety of the "Big Tree" Plum; of Aesculus Bushii 

 Schneider, a hybrid between Ae. glabra var. leucodermis Sarg. and Ae. 

 discolor var. mollis Sarg.; of Crataegus brachyphylla Sarg., C. lacera Sarg. 

 and of C. notha Sarg., the last a hybrid between C. apiifolia Marsh, and 

 C. brachyphylla. Another interesting tree found in this vicinity is Sophora 

 affinis T. & G., a southern species most abundant on the limestone hills of 

 central and western Texas. Here it grows on the top and slopes of the 

 gravelly ridges, where it attains a medium size for the species and flow r ers 

 and fruits freely. 



Descending into the moist sandy ravines we find, especially on the north 

 sides, the banks clothed with ferns and herbaceous flowering plants and 

 such shade loving woody species as Evonymus americanus L. and Vac- 

 cinium virgatum Ait. In such situations is often found the delicate little 

 Partridge Berry (Mitchella repens L.) and sometimes such Orchids as 

 Hexalectris, Spiranthes and Corallorrhiza. 



The springs that issue from some of the deeper of these canyons and the 

 quantities of fine sand and humus eroded through their action and 

 that of the intermittent floods spread out over the low grounds in 

 the valleys and form bogs. These sometimes have quite a characteristic 

 flora. Typical of such situations and their environs are Myrica cerifera 

 L., Ilea virginica L., Amorpha paniculata T. & G., Alnus rugosa K. Koch, 



