The Flora of the Cayuga Lake Lasix 42.} 



28. Petasites (Tourn.) Mill. 

 1. P. palmatus (Ait.) Gray. Sweet Coltsfoot. 



Shaded calcareous springy places ; rare. April-May 15. 



In a marsh s. of Pulpit Rock, Buttermilk Glen, 1873 ((7. IV. Wood), exteimi- 

 nated in 1875 (D.) ; near Smith Corners n. of Cayuta Lake, 1875, station later de- 

 stroyed (D.). 



Lab. and Newf. to Alaska, southw. to e. Mass., w. Conn., N. Y., Mich., Wis., and 

 Minn. 



29. Erechtites Raf. 



1. E. hieracifolia (L.) Raf. Fireweed. 



Thickets and clearings in not too dry gravelly soil, in both acid and alkaline 

 regions ; common. Aug.-Sept. 



P. E. I. to Ont, southw. to Fla., 111., Nebr., and Tex., including the Coastal Plain. 



Individuals with the upper leaves reduced in size (var. intermedia Fernald, see 

 Rhodora 19 : 27, 1917) are even more common than those with large leaves. 



30. Senecio (Tourn.) L. 



a. Leaves all similar, the cauline ones pinnately lobed ; heads discoid. 1. 5". vulgaris 

 a. Leaves of different types, the basal ones cordate-orbicular ; heads usually radiate. 



2. S. aureus 



1. S. vulgaris L. Common Groundsel. 



A weed in rich cultivated ground, in more or less calcareous districts ; scarce. June 

 15-Sept. 



Below Cascadilla Place, 1869 (D.) ; on C. U. campus, 1881 (D.) ; now frequent 

 between L. V. R. R. yards and Cayuga Lake, and on C. U. campus ; Aurora, by 

 the railroad (D.) ; especially abundant in gardens at Union Springs. 



Newf. to Hudson Bay, Minn., and B. C, southw. to N. C. and Mich. ; rare on tin- 

 Atlantic Coastal Plain and in granitic N. E. Naturalized from Eu. 



2. S. aureus L. Golden Ragwort. 



Springy and boggy calcareous meadows, rarely on wet rocks ; frequent. May 15- 

 June. 



Headwaters of Cayuga Inlet ; Spencer ; Larch Meadow ; Six Mile Creek ; Fall 

 Creek ; Mud Creek, Freeville ; McLean Bogs ; Westbury Bog ; and elsewhere. The 

 species occurs on wet rocks at Beebe Lake and Six Mile Creek. 



Newf. to Wis., southw. to Fla., Mo., and Tex. ; frequent along the coast. 



Though all of the above-named stations are in marly meadows or on limy rocks, 

 ihe plant is by no means confined to calcareous soil in N. E. and in the coastal 

 regions. 



31. Arctium L. 



a. Outer and inner involucral bracts subequal, the outer bracts about 10 mm. tong 

 except in the smallest heads ; corollas 10-13 mm. long, the limb longer than the 

 slender tube, the teeth 1.8-2.2 mm. long; heads large, corymbose; petioles solid, 

 very rarely some of them hollow. 1. A. Lappa 



a. Outer involucral bracts successively shorter than the inner, the outermost ones 

 3-5 mm. long ; corollas 9-10 mm. long, the limb almost or quite equaling the 

 tube, the teeth proportionally shorter, 1-1.2 mm. long; petioles usually hollow. 

 b. Heads racemose or racemosely clustered, small to medium-sized, 1.5-3 cm. in 



diam. 2. A. minus 



b. Heads corymbose, averaging somewhat larger. 2a. A. minus. 



var. corymbosum 



