I
a. Leaves not lohed. Mericarps with two to three ribs on each side.
1. Hydrocotyle A sia tic a {Linn. Sp . PI. 2 3 4 ) ; pubescens v . glabrata, foliis ovato-oblongis v.
rotundato-cordatis siuuatis crenatis integerrimisve, pedunculis folio brevioribus, involucr i foliolis 2 ovatis,
umbellis 2 -3 -flo r is , mericarpiis utrinque 2 -3 - c o s ta tis planis reticulatisve.— B C . P r o d r . iv. 6 2 ; F l. N . Z eal.
i. 8 3 . H . cordifolia, Nob. in Hook. Ic . P I. t. 3 0 3 . [Gunn, 8 7 6 .)
Hab, Marshes, Arthur’s L ak es, Circular Head, and Launc eston, Gunn.— (F l. Jan.) {v. v .)
Dis t r ib . T h roughout Australia, N ew Zealand, and th e Tropics generally.
A very distinct species, easily recognized by its robust habit, leaves fascicled at the rooting nodes of the
creeping stem, petioles often very long, blade of the leaf cordate-crenate or entire, blunt.—Peduncles short. Invo-
lucral leaflets few, large. Flowers two to three. Mericarps lai-ge, with broad ribs.
b. Leaves lobed {not p a r tite to the base). Umbels nuxny-fiowered. Mericarps with one ridge.
2 . Hydrocotyle hirta (Br. iu Rich.- Hydr. n. 4 0 ) ; pubescenti-pilosa, caulibus vage repentibus,
foliis utrinque hirtis gracile p e tiolatis reniformibus 7 -9 -lo b is , lob is brevibus obtusis dentatis crenatisve,
pedunculis p e tio lis brevioribus, floribus numerosis capitatis sessijibus, mericarpiis parvis utrinque 1 -costatis.
— B C . P r o d r . iv. 6 6 . H . densiflora, B C . P ro d r . iv. 6 7 . {Gunn, 5 5 3 .)
Hab. A bundant in w e t places throu gh ou t tbe Colony.— (FI. summer.) {v. v.)
Dist r ib . S outb-eastern Australia aud N ew South Wales.
A slender, creeping species, always more or less hairy or very pubescent.— Leaves solitarj', renifoi-m, seven- to
uine-lobed, lobes toothed or crenate. Umbels many-flowered, capitate. Flowers sessile. Mericarps small.
c. Leaves lohed {not p a r tite to the basé). Umbels few {three- to six-flowered). Mericarps with one ridge.
3 . H ydrocotyle peduncularis (Br. in Rich . Hydr . p. 3 8 . f. 2 6 ) ; cæspitosa, glaberrima v. p u b escens,
caulibus r igidiusculis, foliis minutis brfeve petiolatis reniformi-rotundatis 3 -5 - lo b is , lob is grosse dentatis
glabris V. subtus petiolisque hirtis, pedunculis pe tiolis æquilongis, umbellis su b -3 -6 -flo r is , floribus brevissime
p edicellatis, mericarpiis u trinque 1 -costatis.— B C . P ro d r . iv. 6 6 ; Nob. in Lon d . Journ. B o t. vi. 4 6 7 . (Tab.
X X X I I . B )
Var. a ; foliis inciso-dentatis supra glabris.— P lan ta Brownii.
Yar. yS; foliis obtuse lobatis, lob is 3 -crenatis glabriusculis, p etio lis hirsutis. {Gunn, 8 7 8 .)
Var. 7 ; caule gracili, fo liis obtuse lobatis utrinque hirtis, pedunculis petiolisque hirsutis. [Gunn,
1 1 1 9 .)
Var. S ; caule e longato, foliis profunde lobatis, lob is obtuse 3-fidis crenatisve utrinque petiolis pedunculisque
glabratis v . parce p ilo sis.— N . gracilenta, Nob. in L o n d . Journ. Do?, vi. 4 6 7 . {Gunn, 8 7 8 ? 5 5 4 ? )
Hab. Marshes, Circular Head, summit o f tb e W este rn Mountains and Hampshire H ills, Gunn.— (Fl.
D e c .) (v . V.)
Dis t r ib . South-eastern Australia.
A very variable plant, often extremely minute.—i ”?««« tufted and matted, stout. Leaves very variable in size,
from 1 line to i inch diameter, roimded and reniform, three- to five-lobed, generally glabrous above and pilose
below ; lobes coarsely toothed. Peduncles about as long as the petioles. Umbels generally three-flowered. Fruit
shortly pedieelled.—Compared to the size of the leaves, the stems of this plant are often remarkably robust, and
often covered rvrith tbe withered remains of the old stipules and bases of the petioles.—PlATE XXXII. B. Fig. 1, leaf;
2, flower ; 3, the same with the petals and stamens removed ; 4 , fndt ; 5, transverse section of ditto ;—a ll magnified.
4 . Hydrocotyle Tasmanica (N ob . in Lond. Journ. B o t. vi. 4 6 7 ) ; caule graciliusculo glabro v.
hirto, pe tiolis pedunculisque æquilongis hirtis. foliis reniformibus reniforrai-rotundatisve obtuse 5 -7 -lo b is
utrinque hirtis ï . superne glabris, lobis 3 -5 -c r en a tis dentatis, stipulis ovatis ob tu sis integerrimis, umbellis
sub-e -flor is, mericarpiis utrinque 1-costatis, (G m n , 5 5 3 , 1 1 1 8 .) (T a b . X X X I I . r f . )
H a b . Marshes in various parts o f the Colony, as at Circular Head and Ar thur’s L akes, Gunn.— (V\.
Jan.)
D i s t k i b . South-eastern Australia.
A smaU species, ve iy similar to E . hirta, Br., b u t ivilli narrower stipules, fewer flowers in th e umbel, and
with th e leaves seldom hairy on bo th sm f a c e s .-P lA T E XXXII. A . F ig . 1, le a f; 3, flower ; 3. d itto, w ith petals
removed; 4 , p e ta l; 5, f ru it; 6, transve rse section of d itto ;— a ll magnijied.
6. Hydrocotyle vagans (H o ok . fli. in Lond. Journ. Bot. vi. 4 6 8 ) ; glaberrima v. sparse pilosa, caule
gracili elongato, foliis gracile petiolatis reniformi-rotundatis 6 -7 - lo b is membranaceis lob is obtnse crenatis,
poduiicnlis petiolo m ultotie s brevioribus, umbellis parvis su b-6-llor is, mericarpiis utrinque 1-eostatis.
( Gunn, 1 7 4 , 5 6 4 .) (T a b . X X X I I I . A.)
H a b . A bundant iu flooded places. South E sk Eiver, G m n .
D i s t r ib . South-eastern Australia.
A larger species tlian any of the preceding of this section, generally quite glabrous, but with sometimes a few
hairs on the stem, petioles, peduncles, and leaves.— Afeiiii long and slemler, in drier places rigid. Leaves with long,
slender petioles, rounded-remform, obtusely lobed ; lobes obtusely crenate. F edum la much shorter than the petioles.
UmieU about six-flowered. P ru it like that ot the three preceding species.— P l a t e XXXIII. A . Fig. 1,
flower ; 2, immature frait ; 3, transverse section of ditto a ll magnified.
6 . Hydrocotyle pterocarpa (Muell. iu Trans. V ie t. lu s t it . 1 8 6 4 - 5 , p. 4 6 ) ; glaberrima v. parce
pilosa, caulibus gracilibus elongatis, foliis longissime petiolatis peltatim reniformi-rotundatis obtuse creuato-
lobatis membranaceis, pedunculis petiolo brevioribus, umbellis 3 -5 -flo r is , mericarpiis compressissimis late
alatis utrinque bilobis. (T a b . X X X I I I . B . e t C.)
H a b . F ormosa, Gnnn.
D is t r ib . South-eastern Australia, M u e lle r.
^ I have but very indifferent Tasmanian specimens, that were interlaced with some other aquatic plants sent by
Gunn ; these however exactly accord with better ones sent from Victoria by Mueller. This is a larger speeies thau
any of the preceding, with long, creeping stems, slender petioles 2 -6 incbes long, large, membranous, rounded-
reniform, almost peltate leaves, more or less obscm-ely lobed or crenate, with broad, truncate lobes, and short
peduncles.— Ni-Ki? pedieelled, much larger tban in any other Tasmanian species, deeply notched or lobed at the base
and apex. Mei-icarps very much compressed, with one conspicuous ridge on eacb face, and a broad, dorsal wing.—
P l a t e XXXIII. A , Tasmanian, and C, Victoria specimens o f II . ptei-ocarpa : ~ Y \g . 1, flower; 2, fruit, 3, transverse
section of ditto—all from Victoria specimens, and highly r.
d. Leaves divided to the base into three to fiv e segments.
7. Hydrocotyle tripartita (Br. iu Rich . Hydr. p. 4 6 . f. 2 5 ) ; glaberrima v. pilosula, caulibus e
radice ileseeiidente plurimis undique patentibus rigidis gracilibus parce divaricatim ramosis et fobosis non
aut raro radicantibus, foliis breve petiolatis palmatisectis, segmentis 3 - 5 angusto-cuneatis trifidis, peduii-
cu lu s floriferis brevibus fructiferis pe tiolo brevioribus longioribusve, fructibus 8 - 2 0 pedicellatis, mericarpiis
utrinque 1-costatis inter costam et commissuram foveola impressa notatis.— DG. P ro d r. iv. 6 5 ; Hook. Ic .
P I. t. 3 1 2 . {Gunn, 5 4 7 .)
U ab. Penquite , near Launceston, Gunn.— (F l. Oct.)
Dist r ib . Soutb-eastern Australia ; Melbourne,
A very remarkable and distinct bttle species, quite unlike any other known to me in liabit and characters.—
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