XCV1 ADDENDA TO THE 



P. 326. 



Hydro lea quadrivalvis, Walt. The genus differs from most 

 Hydrophyllacese 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. Polemonium caeruleum, L. Stem erect (l-3 high) ; leaflets 

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

 style mostly exsertcd ; 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*. Asclepias Meadii, n. sp. Torr. Very smooth, pale ; stem simple 

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

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

 tuse, mucronate, the plane (not wavy) margins and the numerous rather slender 

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

 (4" long), half the length of the pedicel ; hoods of the slightly stipitate crown fleshy 

 below, rounded-truncate at the summit, longer than the thickish incurved horn, 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^'-ty' long. 

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

 A. Sullivantii or A. obtusifolia. 

 P. 354. 



l a . Acerates monocepliala, n. sp. Lapham in herb. Low (6' -12' 

 high), rather stout, hirsute; leaves lanceolate, almost sessile (about 2' long and 

 ' wide) ; umbel .solitary and terminal, peduncled, very many-flowered ; divis- 

 ions of the greenish corolla oblong (2^" long), more than twice the length of the 

 calyx, several times shorter than the pedicels ; hoods of the crown sessile at the 

 base of the tube of filaments, strongly concave, oblong, erect, with the obtuse 

 apex somewhat spreading, equalling the anthers. Prairies of Wisconsin, Lap- 

 ham, Mr. Cornell. July. Intermediate in several respects between A. viridiflora 

 and A. longifolia; having the sessile crown of the former, and flowers not larger 

 than those of the latter. Hoods more cucullate than those of A. viridiflora ; the 

 two small appendages within each (and the still smaller pairs of appendages 

 alternate with the hoods) more conspicuous than in the last-named species; 

 otherwise very similar. Pollen-masses also thicker and less club-shaped. A. 

 longifolia is well distinguished by the raised crown, of broader hoods, much 

 shorter than the anthers, and by the thick and short pollen-masses. Should 

 Dr. Engelmann's surmise prove correct (as is most likely), this species will bear 

 the name of A. lanuginosa, Decaisne. 



