75. FRTICACIIJS. 319 



4. C hamuldta (Kiitz.) ; fr. 'broader than long nearly sessile 

 or stalked, lobes parallel with a blunt dorsal ridge fiat on the 

 sides, styles divaricate and reflexed over the sides of the fruit, 

 bracts Jalcate very deciduous.— iJ. v. 130. Sy. E. B. 1273.— 

 L. linear ; upper ones broader in the middle ; uppermost ovate- 

 spathulate. Bracts hooked, overlapping, perhaps confined to 

 the male flowers. Fr. small, the size of that of C verna. — /3. 

 C. pedunculata (DO.) ; 1. linear, upper 1. rather broader, fr. 

 stalked. Plant usually very small. — Lakes and streams. ^. 

 Marshes. A. or P. VI.— IX. E.S.I. 



B. L. uniform, enlarged at the base, linear. Fr. of 4 

 nearly free lobes. 



5. C. trvmcdta (Guss.) ; fr. shortly stalked, lobes with a blunt 

 dorsal ridge, styles reflexed-patent, bracts 0. — C autumnalis 

 Hook, (not L.). E. B. S. 2606. — L. all submersed, uniform, 

 very abrupt at the end, translucent green. — Amberley, Suss. 

 Glansiskin, Co. Cork. A. or P. IV.— IX. E. I. 



6. C. autummUis (L.) ; fr. nearly sessile, lobes broadly and 

 acutely loinged at the back, styles spreading, bracts 0. — B. B. S. 

 2732. — Fr. 4 times as large as in C. verna, dark brown, 1 or 2 of 

 the lobes often abortive. L. dark green, all submersed, very 

 abrupt a,t the end. — Rare. Anglesea. Several Scottish lakes; 

 Cong, Co. Mayo. A. or P. VI.— IX. E. S. I. 



Order LXXV. UETICACE^. 



Fl. monoecious, dioecious, or rarely perfect. Perianth inferior, 

 4 — 3 — 6-parted, imbricate ; or in the female flowers tubular 

 notched or scalelike and open. Stam. deflnite, free, inserted at 

 the base of the perianth and opposite to its lobes. Ovary free, 

 l-ceUed ; ovules solitary. _ Stigmas 1 — 2. Fr. not bursting. 



1. Pabibtaiiia. Fl. polygamous, surrounded by an involucre. 

 Perianth beUshaped, ^-parted. Stam. 4. Style filiform. — 

 L. alternate. Hairs simple. 



2. Ubtica. Fl. monoecious or dioecious. Males in loose 

 racemes; perianth 4-parted ; stam. 4. Females in capitate 

 racemes; perianth 2-parted; stigma sessile. — L. opposite; 

 Hairs stinging. 



1. Paeieta'eia Linn. ' Wall-PeUitory. 



1. P. diffusa (Koch); 1. elliptic or elliptic-lanceolate 3-veined 

 above the base, bracts combined into an involucre of two 3-lobed 



