172 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



3. MITELLA L. 



1. Mitelia diphyUa L. Miter wort. 



Rich woods; above the fall line; infrequent. May-June. Northern states, south 

 to N. C. 



4. TIARELLA L. 



1. Tiarella corditolia L. F ALSE miterwort. 

 Rocky woods; rare; Fort Washington (Miss Mary F. MMer.) May. Eastern U.S. 



5. SAXIPRAGA L. Saxifrage. 

 1. Saxifraga virginiensis Michx, 



Rocky woods; frequent. Apr. Northern states, south to Ga. (Micranthes vir* 

 giniensis Small.) 



The flowers are shown in plate 30. 



74. HYDRANGEACEAE. Hydrangea Family. 



1. HYDRANGEA L. 

 1. Hydrangea arborescens L. Wn,n hydrangea. 



Rocky woods: frequent. June. Eastern U. S. 



75. ESCALIONIACEAE. 



1. ITEA L. 

 1. Itea virginiea L. 



Swamps below the fall line; frequent. June. Southern states, north to N. J. 



76. GROSSULARIACEAE. Gooseberry Family. 



Plants spineless; flowers in racemes . .1. RIBES. 



Plants spiny; flowers 1-4 in an umbellate cluster 2. GROSSULARIA. 



1. RIBES L. 

 1. Ribes americanum Mill. Wild black currant. 



Rich woods; infrequent; Beaver Creek, Blagdene Mill, Brookland. Apr. Eastern 

 U.S. (R.floridum L'mr.) 



The red currant of cultivation (R. vulgare Lam.; R. rubrum of Ward's Flora) is 

 sometimes found in the vicinity of gardens. 



2. GROSSULARIA Mill, 



1. Grossularia rotundifolia (Michx.) Coville & Britton. Wild gooseberry. 



Rich woods; infrequent; Ammendale, Soldier's Home Road, Bladensburg. Apr. 

 Mass. to N.'C. in the mountains. (Ribes rotundifolinm Michx.) 



A low shrub with spines iu pairs at the base of the leaf stalks. 



77. HAMAMEIIDACEAE. Witch-hazel Family. 



Flowers with a calyx and 4 petals, in small axillary clusters, appearing in late autumn; 



shrubs; leaves with low rounded teeth; branches not winged.. 1. HAMAMELIS. 

 Flowers naked, in stalked globular or conic clusters, appearing in spring; trees; leaves 



with long acute lobe?; branches usually with thick corky wings. 



2. LIQUIDAMBAR. 

 1. HAMAMELIS L. 



1. Hamamelis virginiana L. Witch-hazel 



Moist or rocky woods; frequent above the fall line. The flowers appear in autumn 



after the leaves have fallen; the fruits remain attached for some time. Eastern U. S. 



