644 UMBELLIFERtE. Ekigenia. 



tervals. Carpophore 2-cleft. Seed excavated in front, and incurved at the 

 apex and base. — Small glabrous dichotomously branched (Californian) 

 annuals. Leaves many-parted, with narrow linear segments. Umbels 

 axillary, sessile, of few rays. Involucre and involucels none. Flowers 

 white. " Fruit with the taste of Sison Amomum." Nutt. 



Perhaps not of this tribe ; but the seed is ccelospermous. The habit of the 

 genus is that of Leptocaulis. 



1. A. an gusti folium (Nutt.! rnss.): "leaves triternately divided ; the 

 divisions of the upper cauline ones simply 3-parted ; segments narrowly 

 linear." 



/8. tenellum (Nutt. mss.) : " stem dichotomous from the base ; leaves less 

 divided ; rays of the umbel very slender ; umbellets 1-2-flowered ; seed 

 more rugulose." 



St. Diego, California, Nuttall ! April. — Stem about a span long, erect or 

 spreading. Segments of the leaves about half a line in breadth. Rays of 

 the umbel 2-4. Umbellets 3-4-flowered ; the pedicels slender, about one^ 

 third of an inch long. Fruit scarcely half the size of a mustard seed ; the 

 ribs, especially in the dry state, distinctly rugulose. 



2. A. lali folium {l^ntt.\ mss.): " leaves biternately divided ; the divisions 

 of the lower cauline ones 2-3-cleft ; segments oblong. — Leptocaulis inermis, 

 Hook. Sf Am. hot. Beechey, su])j)l. p. 347 ? not of Nutt. 



With the preceding, Nuttall! Douglas .'—This seems to differ from A. 

 angustifolium chiefly in the leaves being less divided, and the lobes broader. 

 The plant of Hooker & Arnott here cited, is probably the same as ours ; 

 for it exists in Douglas's Californian collection; while the Leptocaulis 

 inermis does not. Hooker & Arnott also state that the fruit is much broader 

 than in the other species (of Leptocaulis), and rugulose, or very slightly 

 tuberculate ; in which respects it agrees with Apiastrum. 



60. ERIGENL\. Nutt. gen. 1. p. 187; DC. prodr. 4. p. 71. 



Margin of the calyx obsolete. Petals obovate-spatulate, flat, entire. 

 Stylopodium depressed. Styles filiform, longer than the ovary, recurved. 

 Fruit contracted at the commissure, didymous. Carpels ovate-reniforin (one 

 of them often abortive) : ribs filiform; the 3 dorsal ones slightly prominent ; 

 the lateral ones near the commissure and indistinct. Intervals without 

 vittEe. Seed with a deep broad cavity on the face, gibbously convex on the 

 back. — A small glabrous vernal perennial, with a globose tuberous root, and 

 a short caudex. Leaves 1-2, nearly radical, 2-3-ternately divided ; the 

 segments pinnately 3-5-parted. Peduncle elongated. Umbel of 3-4 rays, 

 compound, subtended by a involucre of a single bipinnatifid leaf; or the 

 peduncle may be regarded as a branch, bearing a single sessile leaf and a 

 compound sessile umbel at the summit. Involucel of 3-6 linear-oblong 

 entire leaflets. Umbellets 3-5-flowered. Flowers white. 



This genus has no affinity with Hydrocolylc, as Mr. Nuttall has correctly re- 

 marked, although it was left in that genus by Richard, and referred, though doubt- 



