XC1V ADDENDA TO THE 



P. 237. 



jftncea, Don. Flowers nearly as in Nabalus (only 5 in 

 the head), purple or rose-colored, the heads erect and solitary ; pappus copious, 

 soft and whitish ; stems branched, rush-like, 1 high, striate, with few lanceolate 

 or subulate rigid leaves. St. Croix River, Wisconsin, E. Hall ; and common 

 northward. 



P. 250. 



Caillina VlllgaiiS, Salisb., the HEATHER of Europe, was recently 

 discovered by Mr. Jackson Dawson well established in Tewksbury, Massachu- 

 setts, in low grounds, whether indigenous or in some way introduced is still in 

 question. 



P. 318. 



3. LAMIUM ALBUM, L., a perennial species, with rather large white flowers, 

 and petioled coarsely crenate leaves, is found in waste grounds around Boston 

 by Mr, D. Murray. (Adv. from Eu.) 



P. 326. 



Hydro lea quadrivalviS, Walt. The genus differs from most 

 Hydrophyllaccae in having the ovary and pod 2-celled or nearly so, by the pla- 

 centae united in the axis, and the numerous seeds : the species is a pubescent 

 perennial ; the stem ascending from a creeping base, with a slender spine in the 

 axil of most of the broadly lanceolate leaves ; flowers axillary ; corolla blue. 

 In water or wet places, S. Illinois ( Vasey] and southward. 



P. 330. 



2. Polemoililim coerulciim, L. Stem erect (l-.3 high) ; leaflets 

 9-21, lanceolate or oblong-lanceolate; flowers numerous, blue; stamens and 

 style mostly exserted ; pod rather many-seeded. Borders of a marsh 3 miles 

 east of Charlottesville, Schoharie County, New York, Dr. E. C. Howe. July - 

 Aug. Otherwise found in this country only high north, and in the Rocky 

 Mountains and westward, but common in gardens. (Eu.) 



P. 352. 



2 a . Asclepias Meadii, n. sp. Torr. Very smooth, pale ; stem simple 

 (1 high), bearing a single terminal umbel (on a peduncle 3' long); leans all 

 opposite, sessile, oblong, the upper ovate-oblong or somewhat heart-shaped, ob- 

 tuse, mucronate, the plane (not wavy] margins and the numerous Hither sknck-r 

 pedicels downy when young; divisions of the greenish-white corolla oblong ovate 

 (4" long), half the length of the pedicel ; hoods of the slightly stifn'tate crown fli-sliy 

 below, rounded-truncate at the summit, longer than the thickish incurved /torn, fur- 

 nished with a small sharp tooth at the inner margin on each side towards the 

 summit. Augusta, Illinois, Mead. Leaves about 4 pairs, l^'-2' long. 

 Fruit not seen ; so that it is uncertain whether the species should stand next to 

 A. Sullivantii or A. obtusifolia. 



P. 354. 

 1*. Acerates monocepliala, n. sp. Lapham in herb. Low (6' -12 



