108 
HALORAGEjE. 
describes a fugacious inferior 2- parted minute calyx as 
sometimes found. jR. Icon. t. 890. 
1. Myriophyllum Linn. 
1. M. vert icillat urn (L.) ; fl. all axillary whorled, bracts pin- 
natifid. — E. B. 218. — L. whorled pinnatifidly divided into se- 
taceous segments. Bracts longer than the flowers. — Ponds and 
ditches, rare. P. VII. VIII. 
2. M. spicatum (L.) ; fl. whorled forming a leafless spike, bracts 
small entire, spike erect when in bud. — E. B. 83. — L. 4 in a 
whorl, submersed.- — Ponds and ditches. P. VI. VII. 
3. M. altemiflorum (DC.) ; sterile fl. alternate about 6 form- 
ing a leafless spike, spike nodding when in bud afterwards erect, 
fertile fl. about 3 together in axillary whorls at the base of the 
spike. — E. B. S. 2854. — L. 3 or 4 in a whorl, submersed. — 
Ponds and ditches, rare. P. VII. VIII. E. S. 
2. Hitpuris Linn. 
1. vulgaris (L.) ; 1. linear 6 — 12 in a whorl with a callous 
point. — E. B. 763. St. 44. 1. — St. simple, or sometimes branch- 
ing at the base, erect. Fl. in the axil of each of the upper leaves, 
often without stamens. In deep water the submersed leaves are 
elongated flaccid pellucid and not callous at the end. — In stag- 
nant water and slow streams. P. VI. VII. 
3. Callitriche Linn. 
1. C. verna (L.) ; fr. nearly sessile: lobes parallel in pairs 
bluntly keeled on the back, styles constantly erect, bracts falcate. — 
E. B. 722. Kiitz. in R. Icon. t. 881. R. 4746 — Fr. small "lobes 
converging at the back." Floating 1. spatbulate rarely linear, sub- 
mersed 1. linear, "invariably connate." Bracts crossing each other 
over the germen, shorter than the fruit. — Common in stagnant 
water and slow streams. A. or P. IV. — IX. Water Starwort. 
2. C. plutycarpa (Kiitz.) ; fr. nearly sessile : lobes parallel in 
pairs slightly winged at the back, styles erect in the flower reflexed 
closely over the fruit, bracts falcate. — E. B. S. 2864. Kiitz. in 
R. Icon. t. 883 — 889. R. 4748. — Fr. twice as large as that of 
C. verna, pale when dry. L. all ovate or spathulate in all the 
British specimens that I have seen. C. stagnalis (Scop.) Kiitz. 
only differs from this by having the lobes of its fr. all diverging 
in a stellate manner. — Common on mud or in shallow water, 
rarely in deep water, throughout Britain. A. or P. V. — IX. 
3. C. pedunculata (DC.) ; fr. stalked or nearly sessile, lobes 
parallel in pairs obtusely keeled at the back, styles divaricate in 
the fl. reflexed over the fruit, bracts 0. — E. B. S. 2606. — L. linear, 
upper ones broader in the middle. Fr. stalked, small, the size 
