210 AMMIACEAE. 



6. COBIANDRUM [Tourn.] L. Annual slender herbs. Leaf -blades pin- 

 nately dissected. Umbels compound. Involucres wanting. Sepals acute, un- 

 equal. Petals white, often unequal, broadest above the middle. Fruit sub- 

 globose, not constricted at the commissure: carpels with 5 delicate ribs: oil- 

 tubes solitary under the secondary ribs. 



1. C. sativum L. Stems 2-6 dm. tall: blades of the lower cauline and basal 

 leaves with coarse-toothed, incised, or lobed segments, those of the upper leaves 

 with narrowly linear segments: umbel-rays 4-8, 12-21 mm. long: pedicels 1-3 

 mm. long: fruits subglobose or ovoid-globose, 3-3.5 mm. long: carpels slightly 

 ribbed. M. Occasional, in waste places. Nat. of Eu. Sum. CORIANDER. 



7. CONIUM L. Biennial large herbs with spotted stems. Leaf-blades 

 broad, pinnately decompound. Umbels compound, the rays unequal. Invo- 

 lucres and involucels inconspicuous, of entire, scarious-margined bracts or 

 bractlets. Sepals minute or obsolete. Petals white, somewhat unequal, broadest 

 above the middle, inflexed at the apex. Fruit short and thick: carpels with 

 prominent wavy ribs: oil-tubes wanting. 



1. 0. maculatum L. Plants 1-2 m. tall, the stem usually much branched : leaf - 

 blades broad, the segments very numerous: umbels rather long-peduncled ; rays 

 2-4 cm. long: petals white, obovate or cuneate. mostly about 1 mm. long: 

 fruits ovoid, 2.5-3 mm. long. M. Frequent, in waste places. Nat. of Eu. 

 Sum. POISON-HEMLOCK. 



8. BUFLEUBUM [Tourn.] L. Annual or perennial herbs. Leaf-blades 

 entire. Umbels compound. Involucre wanting (in our species). Involucels 

 conspicuous, of entire bractlets. Sepals obsolete. Petals broad, yellow or 

 greenish. Fruit oblong or oval: carpels with slender ribs and no oil-tubes in 

 our species. 



1. B. rotundifolium L. Plants 3-10 dm. tall: leaf -blades oblong, ovate or 

 elliptic, 2-8 cm. long, perfoliate: corolla yellow: fruits 3-3.5 mm. long, about 

 2.5 mm. broad. Occasional, on roadsides and in fields. Nat. of Eu. Sum. 

 THOROUGH-WAX. 



9. CELEE-I Adans. Annual or perennial herbs. Leaf -blades pinnate or 

 ternately decompound. Umbels compound. Involucres present or wanting. 

 Sepals obsolete or minute. Petals white, broad. Fruit somewhat smooth or 

 tuberculate: carpels 5-angled or 5-ribbed, with 1 oil-tube in each interval or 

 2 in the inner face. 



1. C. graveolens (L.) Britton. Stems 2-9 dm. tall: leaf -segments cuneate to 

 suborbicular, incised and toothed: petals 0.5-1 mm. long: fruits ovoid, about 

 1.5 mm. long. [Apium graveolens L.] M. Occasional, on roadsides and 

 about gardens. Nat. of Eu. Spr. and sum. CELERY. 



10. ZIZIA Koch. Perennial erect herbs. Leaf -blades 3-foliolate or ter- 

 nately compound, or the basal ones sometimes simple. Umbels compound, the 

 central umbellet sessile. Involucres wanting. Involucels of a few bractlets. 

 Sepals prominent. Petals yellow. Fruit somewhat elongate, laterally flattened : 

 carpels with 5 slender wingless ribs and an oil-tube in each interval and under 

 each rib. Spr. and sum. MEADOW-PARSNIP. 



Fruits oblong: basal leaves with ternately 2-3-compound blades. 1. Z. aurea. 



Fruits ovate or oval : basal leaves with merely toothed cordate blades. 2. Z. cordata. 



