AMMIACEAE 869 
1. Deringa Canadénsis (L.) Kuntze. Glabrous or nearly so. Stems 3-10 dm. tall, 
finally widely branched : leaf-blades 3-foliolate ; leaflets ovate, oval or elliptic, 4-10 cm. 
long, acute or abruptly pointed, doubly serrate with sharp teeth, the lateral ones often 
lobed : umbels peduncled : rays few, slender, unequal in length : pedicels 2-25 mm. long : 
corolla white, 2-3 mm. broad: fruit oblong, 4-6 mm. long, straight, or curved at full 
maturity. [Cryptotaenia Canadensis (L.) DC. ] 
In thickets and copses, New Brunswick to South Dakota, Georgiaand Texas. Spring and summer. 
22. AMMI L. 
Herbs resembling Daucus in habit and inflorescence. Leaves alternate: blades finely 
divided or dissected, the segments entire or toothed. Flowers perfect, very numerous in 
compound umbels. Involucres and involucels present, the bracts of the involucre, at least, 
divided. Hypanthium truncate. Petals white, very unequal, cleft at the apex. Stylo- 
podium flat. Fruit short, laterally flattened: carpels 5-angled, with prominent ribs and 
an oil tube in each interval. Seeds terete or half-terete. 
Ultimate segments of the leaf-blades toothed : mature umbel open. 1. A. majus. 
Ultimate segments of the leaf-blades entire: mature umbel contracted. 2. A. Visnaga: 
1l. Ammi màjus L. Stem 3-8 dm. tall, branched. Ultimate segments of the leaf- 
blades toothed: mature umbels and umbellets open, the concreted bases of the rays of the 
latter barely 2 mm. broad : fruit 1.5-2 mm. long. 
In waste places, southern Texas. Introduced from Europe. 
2. Ammi Visnàga (L.) Lam. Stem 5-12 dm. tall. Ultimate segments of the leaf- 
blades entire: mature umbels and umbellets contracted, the concreted bases of the rays of 
the latter 3-4 mm. broad : fruit 2-2.5 mm. long. 
In waste places, near Pensacola, Florida, and on ballast at other seaports. Introduced from Europe. 
23. TAENIDIA Drude. 
Perennial caulescent herbs, with glabrous or glaucous foliage. Leaves alternate: 
blades pinnate or ternately compound : leaflets entire or toothed. Flowers in spreading 
naked umbels. Hypanthium with a truncate or nearly truncate margin. Petals 5, their 
tips inflexed. Stylopodium wanting. Styles slender. Fruit oblong, more or less strongly 
laterally flattened : carpels 5-angled, with slender ribs and 3 oil-tubes in the intervals. 
Seeds nearly terete except the flat face. PIMPERNEL. 
1. Taenidia integérrima (L.) Drude. Root stout, tough. Foliage glaucous: stems 
sometimes branched at the base, 3-9 dm. tall, branching above : leaf-blades 5-20 cm. long : 
twice or thrice ternately compound ; leaflets ovate to oblong or oblong-lanceolate, entire, 
1-3 cm. long, apiculate: umbels long-peduncled ; rays 10-20, wire-like, 5-8 cm. long, un- 
equal: pedicels 8-15 mm. long: corolla yellow, 1-1.5 mm. broad: fruit broadly oblong, 
3.5-4 mm. long. 
On rocky hillsides and in sandy soil, Quebec to Minnesota, Georgia and Mississippi. Spring. 
24. BULOPHUS Nutt. 
Perennial caulescent herbs, with tuberous roots. Leaves alternate: blades ternately 
compound. Flowers in compound umbels. Involucre wanting or of 1 bract. Involucels 
usually of 2 bracts. Sepals prominent. Petals white or pink, broadest above the middle, 
inflexed at the tip. Disk with a conic stylopodium. Fruit somewhat elongated, laterally 
flattened : carpels delicately ribbed : oil-tubes 2-5 in the intervals. 
1. Eulophus Americànus Nutt. Foliage glabrous. Stems 8-15 dm. tall, branched 
above, leaf-blades various, those of the basal and lower stem-leaves 1-4 dm. long, biter- 
nately compound, with linear or oblong-linear leaf-segments, those of the upper stem-leaves 
ternate, their leaf segments narrowly linear and elongated : umbels with 10-20 rays : bracts 
of the involucres much reduced or none ; those of the involucels linear-lanceolate, 2 mm. 
long: fruit oblong or oblong-ovoid, 4-6 mm. long, 3-4 mm. broad, the oil-tubes 3 between 
the more or less obsolete ribs, 4 in the inner side. 
In low grounds, Ohio to Missouri, Tennessee and Arkansas. 
25. SIUM L. 
Perennial caulescent herbs of swamps or marshy places. Leaves alternate: blades 
pinnately compound : leaflets toothed, pinnatifid or dissected. Flowers perfect, in com- 
