HippLRis. HALORAGEif:. 531 



slendrr rhizoina, of wliicli sovoral arc infrrlile. Floral Icavos a little longer 

 than the ))ur])li.sli flowers. Anthers oblong. Sliginas penicillate. — We have, 

 beautiful specimens from Mr. Oakes and Mr. Tuekerinan, but the ripe fruit 

 is wanting. 



15. HIPPURIS. Linn. ; Grcrln.fr. t. 84 ; .luss. in ami. mus. 3, t. 30,/. 3. 



Calyx with a minute entire limb. Pel.-ils none. Stamen 1, inserted on 

 the margin of the calyx. Style filiform, stigmalie the whole length, received 

 into a groove of tlie stamen. Fruit cartilaginous, 1-celled, 1-seeded. Seed 

 pendulous. — Aquatic perennial herbs, with simple stems, verticillate entire 

 leaves, and axillary minute flowers, which are often polygamous. — Horse-tail. 



—4. H. vulgaris (Linn.): leaves in whorls of 8-12, linear, acute, sphace- 

 late at the apex. Hook. — Linn. spec. 1. jj. 4; Engl. bot. t. 763; Michx. ! 

 Jl. 1. }J. 1 ; Torr. ! ft. 1. ;;. 2 ; Hook. ! Jl. Bor.-Anu \. p. 217. 



P. lower leaves much longer, membranaceous, not sphacelate at the apex. 

 Hook. I. c. 



In ponds and borders of lakes, Labrador ! Greenland, and Subarctic 

 America! Sitcha and N. W. Coast, to New York ! and Pennsylvania? — 

 Stem a foot or more high. — This ])lant is very uncommon in the United 

 States, and is only found in the more northern portions. The plant so called 

 in the late Mr. Drummond's collection, from Quaker Bridge, New .Jersey 

 {Cotnpan. to hot. mag. 1. j). 46), which it w-as thought might prove a distinct 

 species, is Sclerolepis verticillata (Sparganophorus, Michx.), without flowers, 

 in which case it often much resembles Hi{)puris. 



—^2. //. maritima (Hellen.) : leaves 4-6 in a whorl, lanceolate, obtuse, not 

 sphacelate at the apex. Hook. — Hellenius, diss. Hipp. (1786) ; Fl. Dan. t. 

 1261 ; Reichcnb. ic. bot. t. 86, /. 182 ; DC. I. c. ; Hook. I. c. H. tetra- 

 phylla, Linn. f. suppl. p. 81 ; Richards, appx. Frankl. journ. ed. 2. p. 2. 



Subarctic America from Labrador to Kotzebue's Sound. — Probably too 

 near H. vulgaris. 



3. H. montana (Ledeb.) : very small and slender ; leaves about 6 in a 

 whorl, linear, acute. — Lcdeb. in Reichenb. I. c. f. 181 ; Cham. Sf Schlecht. 

 in Linncea, 4. p. 507 ; DC. I. c. 



Turfy places, Unalaschka, Eschscholtz I Chamisso. — The plant has quite 

 the habit of a small Galium. 



Order LVII. LOASACE^E. Juss. 



Sepals united into an equally S-lobed calyx, persistent. Petals o, 

 sometimes 10, the inner series (transformed stamens ?) mostly dis- 

 similar or smaller, inserted in the throat of the calyx. Stamens 

 numerous, rarely few or definite, inserted with the petals ; a portion 

 of the outer filaments often dilated or petaloid and mostly sterile ; 

 the others commonly disposed in fascicles opposite the petals and 

 slightly united : anthers innate or adnate. Ovary coherent with 

 the tube of the calyx, l-celled, with mostly 3 parietal placentae, "or 

 with 1 free central lobed one" (Lindl.) : ovules numerous, or some- 



