194 ‘UMBELLIFERZ. | Hydrocotyle. 
b. Vitte present. 
Tufted or diffuse. Leaves much dissected. Fruit nar- 
rowed above, nearly terete .. .. 6. OREOMYRRHIS. 
Aquatic. Stem creeping. Leaves terete, fistular, septate 7. CRANTZIA. 
** Umbels regularly compound. Vittz present (obscure in some). Primary 
ridges of the fruit alone conspicuous. 
Littoral. Stems decumbent. Involucre wanting. Car- 
pels nearly terete .. .. 5. APIUM. 
Leaf- segments ending in acicular or spinous points. Um- 
bels in erect spikes or panicles .. 8. ACIPHYLLA. 
Leaves pinnate or decompound. Umbels terminal. Car- 
pels with 3-5 narrow equal wings... . 9. Licusticum. 
Leaves pinnate or 1-3-foliolate in the New Zealand 
species. Carpels with 2 broad lateral wings .. .. 10. ANGELICA. 
*** Umbels regularly mpieeuae pane ridges of the frult prominent, 
covered with bristles se E .. 11. Daucus. 
1. HYDROCOTYLE, Linn. 
Prostrate herbs. 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 ; involu- 
cral leaves usually inconspicuous or wanting. Flowers small, some- 
times unisexual. Calyx-teeth minute or obsolete. Petals entire, 
valvate or imbricate. Fruit laterally compressed, with a narrow 
commissure ; carpels flat, placed edge to edge, with 1 or more pro- 
minent ribs on each face; vitte wanting. Seed straight, laterally 
compressed. 
A genus of about 80 species, spread over the warm and temperate regions of 
the world, but most numerous in the Southern Hemisphere. Of the 9 New 
Zealand species 1 has a wide range in tropical and subtropical countries, another 
is found in North and South America, 2 occur in Australia, the remainder appear 
to be endemic. 
Section I. (Euhydrocotyle). Involucral bracts narrow or wnconspicuous or want— 
ing. Petals valvate. Carpels without secondary ribs or reticulations. 
Leaves deeply 3-7-lobed. Peduncles exceeding the leaves. 
Fruits on long slender pedicels - 1: .. 1. H. elongata. 
Leaves 3-5-foliolate; leaflets cuneate. Peduncles shorter 
than the leaves. Umbels 2-6-flowered 2. H. tripartita. 
Leaves 3-7-lobed almost to the base. Umbels 20-40- 
flowered ; peduncles longer or shorter than the leaves .. 3. H. dissecta. 
Leaves thin, with 5-7shallowlobes. Umbels 3-7-flowered, 
sessile or on very short peduncles (sometimes half as 
long as the petioles in var. heteromeria) 4. H. americana. 
Glabrous or nearly so. Leaves obscurely ‘3-7. lobed. 
Umbels 3-8-flowered. Carpels large, flat, with a broad 
dorsal wing at ie 3 be 
Pilose or nearly glabrous. Leaves obscurely 3-7-lobed. 
Umbels 5-12-flowered. Carpels rounded on the dorsal [die. 
edge oe Se as oe oe 6. H. nove-zealan- 
or 
. H. pterocarpa. 
