46 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



characteristic of the southern Coastal Plain, but themselves extend- 

 ing beyond its geological limits, following the sandy or acid-peaty 

 soils northward and inland. These total 24 species =16 per cent, of 

 the flora. 



To typify this subclass we can cite: Panicum huachucae Ashe, 

 Eriocaulon septangulare With., Juncus canadensis J. Gay, Sisyrin- 

 chium gramineum Curtis, Calopogon pulchellus (Sw.) R. Br., Pyrus 

 arbutifolia (L.) L. f., var. atropurpurea (Britton) Robinson, Ilex verti- 

 cillata (L.) Gray, Myriophyllum tenellum Bigel., Utricularia cornuta 

 Michx., Lobelia Dortmanna L. 



Subclass C. Southern Coastal Plain species ranging from Texas, 

 Florida, the Carolinas, or New Jersey northward along the sandy 

 coastal strip, Long Island, Nantucket, Cape Cod, to Sable Island, to 

 Newfoundland, or Prince Edward Island, uncommon or unknown in- 

 land in continental eastern Canada. These total 23 plants = 15 

 per cent, of the flora. It is noteworthy that the endemic fresh-water 

 sponge, Heteromeyenia macouni Mac Kay, has as its nearest relatives 

 H. ryderi, var. baleni, ranging from Florida to New Jersey, and H. 

 ryderi, var. walshii from Gilder Pond, Mount Washington, Massa- 

 chusetts. 



This subclass contains Ammophila breviligulata Fernald, Agropyron 

 repens (L.) Beauv., var. pilosum Scribn., Carex silicea Olney, Carex 

 hormathodes Fernald, Juncus articulatus L., var. obtusatus Engelm., 

 Habenaria lacera (Michx.) R. Br., Myrica carolinensis Mill., Tillaea 

 aquatica L., Rosa virginiana Mill., Viola primulifolia L., Centuncu- 

 lus minimus L., Teucrium canadense L., var. littorale (Bicknell) Fer- 

 nald, Limosella subulata Ives, and Plantago major L., var. intermedia 

 (Gilibert) Dene. 



Class III. Endemic Plants or Species unknown on the American 

 Continent. This includes 10 plants = 7 per cent, of the flora. 



Subclass A. Endemic Plants. This includes 6 plants = 4 per 

 cent, of the flora. It is notable that in no case were the characters 

 of the endemic plants strong enough to be considered specific; in every 

 case they had to be treated as of formal or varietal rank. The six 

 endemic plants are: Juncus pelocarpus Mey., var. sabulonensis St. 

 John, Calopogon pulchellus (Sw.) R. Br., f. latifolius St. John, Lathy- 

 rus palustris L., var. retusus Fernald & St. John, Epilobium molle Torr., 

 var. sabulonense Fernald, Bartonia iodandra Robinson, var. sabul- 

 onensis Fernald, Hieracium scabrum Michx., var. leucocaule Fernald 

 & St. John. 



