28 



Summary 



1. Many well-drained ridges in the Douglas Lake region, 

 Cheboygan County, Michigan, are occupied by virgin beech- 

 maple forests unless this forest has been destroyed by fire, 

 lumbering, or clearing. 



2. A typical beech-maple forest is characterized by trees of 

 Acer saccharum, Fagus grandifolia, Betula lutea, Tilia glabra, 

 Acer rtibrum, Ulmus americana, and Ostrya virgmiana. In 

 some of the forests Tsuga canadensis may be quite abundant. 

 Shrubs are few and there are about 35 typical ground plants 

 almost always present in beech-maple forests together with 

 some ground plants found in several habitats. Many individuals 

 in this ground cover are seedlings. 



3. The reforestation of beech-maple forests in 11 areas was 

 studied during 1926 by the quadrat method. 



4. Lumbered areas without fire return to beech-maple by 

 means of coppice development. Burnt areas usually involved 

 fireweed and other stages and take longer. Pastured areas art 

 still more involved and greatly favor the sugar maple {Acer 

 saccharum) at the expense of other species. In abandoned 

 cultivated areas, the succession includes weed and meadow 

 stages before the usual stages to the climax beech-maple forest. 



Kansas State Agricultural College, 

 Manhattan, Kansas. 



TWO NE\\' SPECIES OF PORTULACA FROM 

 MEXICO 



Percy Wilson 



1/ Portulaca Conzattii P. Wilson, sp. nov. 



A rather slender, erect, annual herb, 1.5-3 dm. tall, with 

 slender roots, and tufts of long white hairs in the axils of the 

 leaves; leaves alternate, the blades flat, lanceolate, obovate, or 

 oblanceolate, 1.5-2.7 cm. long, 2.5-4.5 mm. broad, obtuse or 

 acutish at the apex; flowers terminal, in clusters of 2 or 3 sur- 

 rounded with long white hairs and an involucre of 8 or more 

 leaves; calyx-lobes triangular-orbicular, 5 mm. long, 6.5 mm. 

 wide; corolla yellow, the lobes obovate or elliptic-obovate, 7-8 

 mm. long, 3-3.5 mm. broad; stamens about 20; style-lobes 4 or 



