29 
secondary ones with reticulations in one species) ; the dorsal mar- 
ginal, broad or filiform; intermediates filiform (rarely obsolete), 
usually curved; laterals filiform or broad, distinct from those of 
the other carpel or confluent; a prominent oil-bearing layer be- 
neath the epidermis, occasionally containing small oil-tubes, 
usually a thick layer of strengthening cells surrounding the seed- 
cavity. 
59. Erigenia. Calyx-teeth obsolete. Fruit nearly orbicu- 
lar, notched at base and apex, glabrous, thin betVv'een the incurved 
carpels. Carpel with equal filiform ribs, very thin pericarp, and 
strengthening cells beneath the ribs. Oil-tubes 1 to 3 in the in- 
tervals, 9 to 11 on the commissural side (from which extends a 
prominent corky neck-like projection, meeting its fellow from the 
other carpel and forming the thin area between the curved car- 
pels). Seed-face narrov/ly and deeply sulcate. 
ARTIFICIAL KEY TO GENERA. 
« 
I. Priiit -prickly or scaly. 
* Fruit prickly along the ribs: 7imbels compound: leaves 
pinnately decompound. 
a- u / 
Stylopodium depressed or wanting Caucus, 1 
Stylopodium conical Caucauis, 2 
* * Fruit without ribs., p7'ickly or scaly all over. 
Flowers in a globose or oblong head; fruit with tubercu- 
late scales: leaves mostly coriaceous and prickly Eeyngium, 2!) 
Flowers in irregularly compounded umbels: fruit covered 
with hooked prickles: leaves mostly palmate, with 
toothed or incised lobes Sanicula, 30 
Fruit covered with hooked prickles: leaves finely dissect- 
ed Leptocauuis, 53 
ir. Fruit not prickly nor scaly. 
* Fruit strongly Jiattened dorsally., with lateral ribs promi- 
nently winged. 
Oil-tubes solitary in the intervals. 
Stylopodium conical. 
