246 UMBELLIFERAE 



1. Anethum graveolens L. Dill. Fig. 3540. 



Anethum graveolens L. Sp. PI. 263. 1753. 



Branching annual, 4-17 dm. high. Leaves pinnately decompound, the ultimate divisions 

 filiform; rays 10^5, 3-10 cm. long; pedicels 6-10 mm. long; fruit ovate, about 4 mm. long. 



Waste places, introduced throughout the United States. Naturalized from Europe. June-Aug. 



35. LOMATIUM Raf. Journ. Phys. 89: 101. 1819. 



Low and short-caulescent or acaulescent, or tall and caulescent, simple or branching, 

 perennial herbs, with slender or thickened subfusiform or tuberous roots, and ternate, 

 pinnate or decompound leaves. Flowers in compound umbels, yellow, white or purple. 

 Involucre mostly none ; involucels present or rarely wanting. Sepals small. Fruit strongly 

 flattened dorsally; carpels with filiform dorsal ribs, the laterals winged, thin to corky; 

 stylopodium none; oil-tubes 1 to several in the intervals or rarely obsolete, 2-10 on the 

 commissure. Seed flattened dorsally, the face plane or slightly concave. [From the Greek 

 word meaning border, referring to the winged fruit.] 



A genus of about 80 species, native to western North America. Type species, Lomatiutn villosum Raf. 



Peduncles not conspicuously inflated at the apex, slender or uniformly fistulose, the rays sometimes dilated into 

 a prominent disc. 

 Fruit more or less deeply emarginate at each end, the wings distinct on each side of the body; leaflets mostly 

 broad in outline. I- 



Fruit not emarginate or scarcely so, the wings more or less joined above and below the body; leaflets mostly 

 narrow. 

 Plants mostly low, from globose or somewhat elongate or irregular tubers; leaves mostly small. II. 



Plants usually stouter, from more or less thickened elongate taproots, sometimes with a very deep-seated 

 tuber. 

 Leaves decompound, dissected into numerous small divisions. 



Ovaries and young (sometimes mature) fruit variously pubescent or roughened. III. 



Ovaries and fruit glabrous. 



Bractlets absent. IV. 



Bractlets present. V. 



Leaves with mostly few or large divisions, ternately or pinnately divided, the divisions mostly re- 

 mote. VI. 

 Peduncles conspicuously swollen and inflated at the apex. 64. L. nudicaule. 



I. 



Leaf-divisions not pinnatifid, merely toothed or sometimes 3-lobed. 



Leaves 1-2-ternate; wings thickened, much broader than the body; oil-tubes solitary in the intervals; south- 

 ern California. 1- ^- I'tcidum. 

 Leaves ternate-pinnate; wings thin, about equaling to broader than the body; oil-tubes 1-3 in the intervals. 

 Fruit broadly oval; plants mostly low; Napa and Lake Counties, California. 2. L. repostum. 



Fruit suborbicular; plants mostly taller, southern Oregon and adjacent California. 



3. L. Hotvellii. 



Leaf-divisions pinnatifid, usually incised. 



Leaf-blades large, longer than the petioles; fruit 12-15 mm. long; San Nicolas Island, California. 



5. L. insulare. 



Leaf-blades smaller, mostly equaling or shorter than the petioles; fruit 7-10 mm. long; California mainland. 

 Leaf-divisions acerose-tipped; wings less than half the width of the body; eastern slopes of the Sierra 

 Nevada, Inyo County. 6. L. rigidum. 



Leaf-divisions not acerose-tipped; wings broader than the body; Monterey and San Luis Obispo Counties. 



4. L. parvifolium. 



II. 



Ovaries and fruit variously pubescent. 



Flowers white or purple; bractlets absent or setaceous. 7. L. Gormanti. 



Flowers yellow; bractlets distinct, obovate and connate. 



Tuber deep-seated, oblong; bractlets united nearly to the apex; fruit ovate, sessile or subsessile; oil- 

 tubes obsolete. IS. L. Watsonn. 

 Tuber globose, or occasionally elongate; bractlets distinct, obovate, scarious-margined; fruit oblong, 

 pedicels 2-4 mm. long; oil-tubes prominent. 19. L. Cous. 

 Ovaries and fruit glabrous. 



Involucels absent or inconspicuous. 



Flowers yellow; pedicels prominent, 4-25 mm. long. 



Plants caulescent, alternately branched above; pedicels 4-15 mm. long. 



Plants glabrous; lower leaves ternate-pinnate; fruit oblong, 8-10 mm. long. 



17. L. ambiguum. 



Plants puberulent; lower leaves 2-3-pinnate; fruit ovate-oblong, 6-7 mm. long. 



18. L. RoUinsii. 



Plants acaulescent, unbranched; pedicels 15-25 mm. long. 11. L. Hambleniae. 



Flowers white; pedicels short or obsolete, up to 2 mm. long. 8. L. Piperi. 



Involucels conspicuous. 



Leaf-divisions few; fruit linear, 1-1.5 mm. broad, constricted toward the apex; wings almost obsolete. 



9. L. orogenioides. 



