68 Rhodora [April 



f. & Jacks. Ind. Kew. ii. 598. P. Raii, Babington, Trans. Linn. Soc. 

 Lond. xvii. 458 (1836) , & Man. Brit. Bot. first six editions. P. Rayi, 

 Meisn. in DC. Prodr. xiv. 88 (a mistaken orthography adopted by 

 several American botanists but not employed by Babington notwith- 

 standing reference to 2d ed. of his Man. by Hook. f. & Jacks. 1. c) . — 

 This species, which may be distinguished from P. Fowkri by the 

 characters given above, may occur upon the coast of our middle 

 states. There is a specimen rather closely simulating it in the her- 

 barium of the New York Botanical Garden, collected at Portsmouth, 

 Virginia, by Rugel, which without a re-examination I cannot pro- 

 nounce upon more definitely. The name Roberti was according to 

 Meisner used to cover mixed material but when previously described 

 elements have been excluded must stand for this species. Plate 35, 

 fig. 16. 



+- +- Erect ; achenes lanceolate. 



P. exsertum, Small. Tall, much branched: leaves lanceolate, 

 acutish : Mowers borne on slender at length exserted pedicels : calyx 

 small, greenish, inconspicuous, much shorter than the lanceolate 

 attenuate olivaceous much exerted achenes. — Bull. Torr. Bot. Club, 

 xxi. 172 (1894), & Monog. Gen. Polyg. 112, t. 43. — Brackish 

 meadows. Maine, York Harbor, E. J\ Bkknell, ace. to Small. 

 Rhode Island, Barrington, S. T. Olney. Connecticut : Orange, 

 beach at Savin Rock, 11 Sept. 1895, C. H. Bissetl, no. 1239 ; East 

 Haven, A. L. Winton. New York, New York City, 24 Sept. 1894, 

 E. P. Bicktiell. New Jersey, Absecom, IV. Boott. Also in the 

 interior from Illinois to the Saskatchewan. Plate 35, figs. 12, 13. 



* * Achenes nearly or quite included. 



4- Branches terete or nearly so. 



++ Flowers small ; sepals (normally 5) greenish white mostly with a 

 roseate tinge, 1.3 to i.S mm. long. 



= Pedicels included in the sheaths; flowers distinctly axillary. 



P. prolificum. Erectum 3-5 dm. altum ramosum vel ramosis- 

 simum ; foliis lineari-oblongis crassiusculis obtusis vel plus minusve 

 acutis in speciminibus siccatis rugulosi-venosis 1-2 cm. longis 1-4 

 mm. latis; stipularum laciniis setiformibus flores subsessiles valde 

 superantibus ; calyce 5-partito, lobis oblongis apice rotundatis 3 

 exterioribus viridibus albo-marginatis saepissime rubescentibus, in 

 maturitate reticulati-venosis interioribus duos tenuiores albos paullo 

 superantibus leviter cucullatis 2 mm. longis ; staminibus 3 ; achenio 

 triquetro brunneo acuto 2 mm. longo, faciebus lanceolati-deltoideis 

 leviter concavis lucidis minutissime punctatis. — P. maritimum, Young, 

 Cat. Fl. Oak Isl. 14 (1883), not L. P. ramosissimion, var. prolifiaim, 

 Small, Bull. Torr. Club, xxi. 271 (1894), & Monog. Gen. Polyg. 114. 



