ZAXNICHELLIA 523 



ZANNICHELIilA, Linn. Gen. n. 920 (Mich. 34). 

 Z. palustris, Linn. Sp. PI. 969 (1753^ Horned Ponchceed. 



Z. major. Boenn. ex Reichb. in Moessl. Handb. ed. 2, iii. 1591. 

 Top. Bot. 423. Syrae, E. B. ix. 56, t. 1425. Nyman, 684. Fl. Oxf. 286. 

 Lacustral. Eivers, streams, and pools. Rather local. P. May- 

 August. 

 First record. Z. pahtsiris, in the neighbourhood of Oxford, has the 

 stigmas frequently somewhat indented, Baxt Phaen. Bot. n. 164. 



1835- 



1. Isis. Wytliam. 



2. Ock. Cothill. Marcham. Radley. Iffley. Uffington. 



3. Pang. Near Moulsford. Standford Dingley. 



4. Kennet. Theale. Mortimer. Silchester. Shaw brickfields. 



Shefford. 



5. Loddon. Windsor, Bolton Kmg. Roadside pond near Paper Mill, 



Wokingham, Tufnail. Shottesbrooke. Whistley Green. Pond 

 near Knowl Hill. 



Var. MACROSTEMON ^Gay, ex Willk. & Lange, Prod. Fl. Hisp. i. 26. 

 as a species'!. This is a much more branching plant than the type, 

 having narrower leaves and four-celled anthers. It occurs in the 

 Thames above Godstow and between Oxford and Iffley, and I have 

 seen the same form near Newbury and in the canal near Mavcham. 

 See the Report of Bot. Record Club 1880 and 1881. 



V/illkomm and Lange say that it differs from^ the type by the sub- 

 sessile instead of slightly stalked imibel, and by the thick straight 

 style, which in the type is bent and slender. 



Var. REPENS (Boenn. Prod. Fl. Monast. 272, as a species). 



This form grows in the sandy and muddy margins of shallow 

 streams, as near Abingdon, and in a pond between Loddon Bridge and 

 Wokingham. 



Z. palustris is found in all the bordering counties. 



Z. pedunculata, Reichb. in Moessl. Handb. ed. 2, iii. 1591. 



Z. dentata, Willd. Sp. PI. iv. 18 r, teste Willkomm and Lange. 

 Z. pedicellata, Fries. Nov. Mant. iii, 133 (1842). 

 Top. Bot. 424. Syme, E. B. ix. 57, t. 1426. Nyman, 684. 

 Native. Lacustral. Brackish streams. Very rare. P. June-July. 

 First found in Berkshire by the author in 1891, 



2. Ock. Marcham, in the saline meadow. 



Z. pedunculata does not appear to be recorded for any inland border- 

 ing county. 



