XCV1 ADDENDA TO THE 



P. 326. 



Hydrdlea qisadia'ivfslvis, Walt. The genus differs from most 

 Hydrophyllaceae in having the ovary and pod 2-eelled or nearly so, by the pla- 

 centa; 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 caern&SeeSBai;, L. Stem erect (l°-3° high) ; leaflets 

 0-121, lanceolate or oblony-lanccolate ; 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 MesUlii, n. sp. Torr. Very smooth, pale; stem simple 

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

 opposite, sessile, oblong, 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 fie si hy 

 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&' - 2^' long. 

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

 A. Sullivantii or A. obtusifolia. 



P. 354. 



P. Acerates nionocepliala, 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. 



