644 UMBELLIFERAE. | Hydrocotyle. 
** Umbels regularly compound. Vittae present (obscure in 
some). Primary ridges of the fruit alone conspicuous. 
Littoral. Stems decumbent. Involucre wanting. Carpels nearly 
terete 1 .. § APIUM, 
Leaf-segments ending in acicular or "spinous ‘points. Umbels in 
erect spikes or panicles; bracts spinous .. ee ace ACIPHYLLA. 
Leaves pinnately decompound, not spinous. Umbels axillary ; 
bracts lanceolate. Fruit oblong, flattened, conspicuously 
winged; one carpel usually 3-winged, the other 2-winged .. 11, CoXELLA. 
Leaves pinnate or decompound. Umbels terminal. Carpels with 
3-5 narrow subequal wings 12. ANISOTOME. 
Leaves pinnate or 1-3- foliolate in the NZ. species. Carpels with 
2 broad lateral wings .. = £2 .. 13. ANGELICA. 
*** Tmbels regularly compound. Secondary Sec of the 
fruit prominent, ‘covered with bristles m .. 14, Daucus. 
1. HYDROCOTYLE Linn. 
Prostrate herbs, usually growing in moist places or hear water. 
Stems long, slender, rooting at the nodes, often matted. Leaves orbicular 
or reniform, deeply cordate or peltate, palmately toothed or lobed or 
divided, rarely entire, long-petioled ; stipules small, scarious. Umbels 
simple, small ; involucral leaves usually inconspicuous or wanting. Flowers 
small, sometimes unisexual. Calyx-teeth minute or obsolete. Petals entire, 
valvate or imbricate. Fruit strongly laterally compressed, more or less 
orbicular in outline ; commissure very narrow; carpels flat, placed edge 
to edge, with one or more prominent tibs on each face, but no secondary 
ribs or reticulations; vittae wanting. Seed straight, laterally com- 
pressed. 
A genus of about 75 species, spread over the warm and temperate regions of the 
world, ‘but most numerous in the Southern Hemisphere. Of the 8 New Zealand 
species, 1 is found in North and South America, and 2 occur in Australia, the - 
remainder appear to be endemic. 
Leaves deeply 3-7-lobed. Peduncles exceeding the leaves. Fruits 
on long slender pedicels .. af és .. J. A. elongata. 
Leaves 3-5-foliolate; leaflets cuneate. Peduncles shorter than 
the leaves. Umbels 2-6-flowered rr a .. 2. A, tripartita. 
Leaves 3-7-lobed almost to the base. Umbels 20-40-flowered ; 
Sa cietes longer or shorter than the leaves 3. H. dissecta. 
Leaves thin, with 5-7 shallow lobes. Umbels 3-7. fewerad: 
sessile or on very short peduncles (sometimes } as long as the 
petioles in var. heteromeria) 4, H. americana. 
Glabrous or nearly so. Leaves obseurly 3-7-lobed. Umbels 3-8- 
flowered. Carpels large, flat, with a broad dorsal wing 5. H. pterocarpa. 
Pilose or nearly glabrous. Leaves obscurely 3—7-lobed. Umbels 
5-12-flowered. Carpels rounded on the dorsal edge .. 6. H. novae-zealan- 
Hispidly pilose. Leaves sharply 5~-7-lobed.. Umbels 10-20- [diae. 
flowered. Carpels acute on the ide: edge 7. H. moschata. 
Small, glabrous or nearly so. Leaves ;4,—4 in., ~5-T-lobed. Umbels 
2—6-flowered. Carpels rounded on the dorsal edge .. .. 8. A. microphylla. 
1. H. elongata A. Cunn. Precur. (1838) n. 495,—More or less softly 
pilose, rarely almost glabrous. Stems 4-12 in. long, very slender, branched, 
creeping and rooting at the nodes. Leaves 4-lin. diam., orbicular- 
reniform, deeply 3~-7-lobed; lobes rounded, acutely toothed : petioles 
slender, 1-3in. long or more ; stipules small. Peduncles very slender, 
exceeding the leaves ; umbels 10-30- flowered. Flowers minute, on slender — 
pedicels. Fruit small, brownish, ;4,in. diam., more or less pubescent or 
bristly; carpels with one rib on each face —Raoul Choix (1846) 46 ; 
