1916] Fernald & Weatherby, — Puccinellia 11 



serrulate at summit; the midnerve often excurrent and minutely 

 scabrous at tip, with a few hairs at base: palea slightly shorter, 

 linear-oblong, scarcely tapering to the bidentate or fimbriate summit, 

 ciliate to the base with slender hairs of about uniform length: anther 

 0.8-1 mm. long: grain 2 mm. long. — Poa rupestris With. Arr. Brit. 

 PI. ed. 3, ii. 146, t. 20 (1796). Poa procumbens Curtis, Fl. Lond., 

 fasc. vi. t. 11 (Exact date of publication not known but probably 

 later than Withering's species. See note below). Sclrrochloa pro- 

 cumbent Beauv. Agrost. 98 (1812). 8. rupestris Britten & Rendle, 

 Journ. Bot. xlv. 107 (1907). Glyceria procumbent Sm. Engl. Fl. i. 

 119 (1824). Festuca procumbena Kunth, Gram. i. 129 (1829). Atropis 

 procumbens Thurb. Bot. Cal. ii. 309 (1880); Beal, Grasses Am. ii. 

 575 (1896). — Atlantic coast of Europe; adventive in America. 

 Occasionally reported on ballast. Seen by us only from New York: 

 ballast, New York, June, 1880, Addison Brown. New Jersey: 

 ballast, Kaign's Point, D. Burke in herb. Phil. Acad.; Petty's Island, 

 July 3, 1867, Burke in herb. Phil. Acad. 



Britten & Rendle give excellent reasons for concluding that Poa 

 rupestris With, was published earlier than P. procumbens Curtis: — 

 see Journ. Bot. xlv. 107 (1907). In addition to their reasoning it 

 may be noted that Withering, in his original description (ed. 3) states 

 merely that the plant was "Gathered on St. Vincent's Rocks, near 

 Bristol, by Mr. Milne, who observed to me that Mr. Curtis first found 

 it there." In his 4th edition, ii. 147 (1801) he adds, "Sir Thomas 

 Frankland found this plant growing on the waste ground near the 

 Dock, betwixt Bristol and the Hotwells. Also on the new Pier at 

 Scarborough." This additional information is given in Curtis's 

 publication and presumably taken from it by Withering (though he 

 makes no acknowledgment) and the natural inference is that Curtis's 

 species was published after Withering's 3rd edition and before the 4th. 

 Also, Withering cites "Curt." in edition 4, not in edition 3. 



-*- >»- Lemma not coriaceous; its midnerve not excurrent: lower 

 branches of the panicle floriferous chiefly above the middle, if below 

 loosely flowered and the panicle much elongated (2-3 dm. long): plants 

 mostly perennial. 



++ Lemmas and glumes erosc-serrulate or ciliolate. 

 = Lemmas truncate-obtuse and erose-ciliolate at the broad tip, with a 

 few hairs at base. 



5. P. distans (L.) Pari. Figs. 23-27. Culms 2-6 dm. high, rather 

 slender: leaves green, rarely glaucous, 3.5-10 cm. long, 2-0 mm. broad, 

 flat: panicle green or violet-tinged 0.8-2 dm. long, ovoid, lax; the 



