MONOECIA— TETRANDRIA. Alnus. 131 



Subularia repens, folio minus rigido. Dill, in Linn. Corresp.v.2. 



136. 

 S. repens, foliis convexo-planis. Dill. Muse. 542. ^.81. 



In watery sandy places, especially about the margins of lakes and 

 pools. 



Perennial. June. 



-Roo^ somewhat fleshy, tap-shaped, with numerous simple fibres, 

 as well as some horizontal runners, from the crown. Stem none. 

 Leaves several, ascending, 3 or 4 inches long, linear, entire, 

 fleshy, slightly channelled ; commonly smooth, but the Rev. Mr. 

 Williams has found a hairy variety in Shropshire. Barren^, 

 generally solitary, on simple upright stalks, greenish ■ fertile 

 ones radical, sessile, their styles chiefly visible. Mr, Wilson of 

 Warrington has communicated specimens of a variety with 2 

 barren /lowers on each stalk, found in Anglesea, in only one 

 place, but there plentifully. 



430. ALNUS. Alder. 



Tourn.t. 359. Willd.Sp. PI. v.4. 334. Hall. Hist, v, 2. 300. Comp. 

 ed.4.i46. Gcerin.t. 90. 



Nat. Ord. Amentacece. Linn. 50. Juss. 99. 



Barr.Jl. numerous, aggregate, in a loose, cylindrical cat- 

 kiji, imbricated every way. Cal. a permanent, wedge- 

 shaped scale, 3-flowered, with 2 very minute lateral 

 scales. Cor. composed of 3 e(\\.\ii\ florets, attached to the 

 inner side of every scale, each of 1 petal, in 4 deep, equal, 

 ovate, obtuse segments. Filam. 4, from the tube of the 

 corolla, shorter than its segments, and opposite to them. 

 Anth. of 2 round lobes. 



Fert. fl. fewer, aggregate, in an oval firm catkin, imbricated 

 every way. Cal. a permanent, wedge-shaped scale, 2- 

 flowered. Cor. none. Germen comj>rcsscd, of 2 cells. 

 Styles 2, parallel, tapering, a little prominent, deciduous. 

 Sti^rm. simple. Kut ovate, bony, compressed, angular, 

 without wings, of 2 cells. Kerticls solitary, ovate, acute. 



Trees, with hard wood. Leaves alternate, stalked, simjilc, 

 wavy or cut, deciduous, with twin deciduous stijmlas. 

 Catkins terminal, panicled, j)endulous, earlier than the 

 foliage. 



1. A, glutinosa. Common Alder. 



Leaves roundish-wedge- sha})eil, wavy, serrated, glutinous, 

 rather abrupt; downy at the branching of the vcijis be- 

 neath. 



k2 



