14 TKE JOURNAL OF BOTANY; 



that it was made " from a specimen collected by Mrs. Hopkins in a 

 canal near Bath." If this were the case, it was the onl}" specimen she 

 found, as the leaves in all the Bath examples I have seen are distinctly 

 petioled. Syme (E. Bot. 3, ix. 89) regards the Bath plants as " a 

 weak state of lucenSy'' which seems to be the case. 



P. clecipiens var. affinis mihi in Jom-n. Bot. 1879, 289, and Exch. 

 Club. Hep. 1880, 35, is a very odd and difficult plant to name ; Hag- 

 strom merely mentions it, not having seen specimens. Trimen in 

 Journ. Bot. 1867, 289, suggested P. salicifolius Wolfs^. ; Syme in 

 Ex. Club. Rep. 1876, 35 (1878), nitens Web.; above" I called it 

 decipiens (see above) ; later I suggested X Brotlierstonii {^decipiens 

 y. nitens; see Linton in Journ. Bot. 1907, 300), but no ^zzY<?w5 seems 

 to produce fruit. After all, I think my first suggestion ma}^ stand. 



It occurs in the canal. Warwick. 1862, BaJcer ; Tweed. Fishnick. 

 Berwick. 1876, Brotherston ; Sprouston and near Kelso. Roxburgh, 

 1875, Brotherston. 



The specimens are very dark, nearly black ; the lower leaves 

 120 mm. X 30 mm., upjDcr 80 mm. x 25 mm., clasping at the base, thus 

 suggesting decipiens XperfoUatus. 



■*P. Torssandri (Tis.) P. decipiens ft. Torssandri Tis. Pot. snec. 

 exsicc. ii. n. 75 (1895), p. 216, P. graminensxlucensxpeiifoliatus. 

 The author says, " I have formerly considered the (p. 216) plants 

 belonging hereto to be a mule betAveen P. Zizii iiw^ perfoliatus, but 

 must now leave [it] open . . . possibly P. liicensx nitens, or decipiens 

 Xgramineus.''^ The plant occurs in Sweden, Denmark, and Fi-ance. 

 '* It resembles much P. nitens, and is distributed by Ar. Bennett as 

 P. nitens var. r}. cuspidatus in Graebner, Potamog. 1907, 91." This 

 refers to specimens in the National Herbarium, where I suggested the 

 name many years ago. The plant is, like affinis, veiy difficult to 

 name with any certainty. It occurs in Britain : I have a specimen 

 from Wareham, Dorset, collected by E. F. Linton, in 1893. 



The finding of P. upsaliensis Tis. at Wool in Dorset was partici- 

 pated in by Mr. Grreen, as well as by Miss Ida M. Roper. Hagsti-om 

 divides decipiens into three varieties : a. latifoliiis, with three 

 forms ; ft. hrevifolius, and y. longifoUus with two each. 



The Wool plant falls under LongifoUus f. npsaliensis. 



P. ANGUSTiFOLius Berclit. & Presl=P. Zizii Roth (p. 210). 



Sweden to Jemtland and Medeimd ; South Norway, Finland to 

 66° 20' n. lat. (Wainio). Britain to E. Ross. 57° 30' n. lat. 

 (Men7iell). 



The author doubts whether this name applies to Zizii, but the 

 Bohemian botanists have no doubt, and Fieber, Presl, Kosteletsky, 

 and Celakovsky so consider it. Hagstrom refers to and figures 

 (103 B) a rare form of leaf with reduced lamina (as in lucens 

 acuminatus) from "Long Drove, Pidly Fen, Hunts. Fryer.'" 

 This also occurs in Westmoor, Chatteris, Cambs, where I gathered it 

 with Fr3^er in 1886, and in Surrey {Beehy). He remarks: "lam 

 persuaded that P. Zizii rarely, if ever, propagates itself by seeds." 

 There is no doubt that it does so in Cambridgeshire ; in a ditch on 

 Witcham Meadlands Fryer showed me plants that had come from 



