866 AMMIACEAE 



1. Erigenia bulbosa (Michx. ) Nutt. Tuber deep-seated, subglobose, 5-12 mm. in 

 diameter. Foliage glabrous : leaves basal, 3-5 cm. long ; petioles dilated at the base ; 

 blades ternately twice compound ; segments of an oblong type ; scapes erect, 5-20 cm. tall, 

 sometimes branched at the base : involucres foliaceous : fruit about 2 mm. high, 3-4 mm. 

 broad, conspicuously ribbed. 



In open woods or copses, Ontario to Minnesota, District of Columbia, Alabama and Kansas 

 Spring. Harbinger of Spring. 



13. MUSENIOPSIS Coult. & Rose. 



Perennial acaulescent herbs, with thick and elongated roots. Leaves basal : blades 

 pinnate. Involucre wanting. Involucels of few small bractlets. Flowers perfect, in simple 

 umbels. Hypanthium truncate or nearly so. Sepals obsolete. Petals yellow. Fruit 

 laterally flattened, smooth, considerably longer than broad : carpels with equal filiform 

 ribs, the pericarp thin : oil-tubes 3 or 4 in the intervals and 4 on the commissural side. 

 Seed-face with a deep groove. 



1. Museniopsis Texana (A. Gray) Coult. & Eose. Glabrous. Leaf-blades 5-7-pin- 

 nate, the lower divisions stalked and pinnately parted, the segments cuneate, 3-5-cleft : 

 scape 5-20 cm. tall, surpassing the leaves, somewhat scabrous near the umbels : umbels 5-8- 

 rayed : fruit oblong-ovoid, about 3 mm. long, smooth and glabrous. 



On plains or prairies, Texas and adjacent Mexico. Spring. 



14. BUPLEURUM L. 



Annual or perennial herbs, with glabrous or glaucous foliage. Leaves alternate : blades 

 entire, sessile, clasping or perfoliate. Flowers perfect, in compound umbels. Involucres 

 wanting (in our species). Involucels whorls of entire bracts. Hypanthium truncate or 

 nearly so. Sepals obsolete. Petals broad, yellow or greenish, with inflexed or infolded 

 tips. Styles short. Fruit oval to oblong, somewhat laterally flattened : carpels with 

 slender ribs and no oil-tubes in our species. 



1. Bupleurum rotundifolium L. Plant glaucescent. Stems 3-10 dm. tall, branched 

 above : leaf-blades thickish, oblong, ovate or elliptic, 2-8 cm. long, perfoliate, palmately 

 nerved : bracts of the involucre wanting : bractlets of the involucels oblong, oval, ovate or 

 suborbicular, abruptly pointed, prominently nerved: fruit 3-3.5 mm. long, about 2.5 mm. 

 broad, the ribs slender ; oil-tubes wanting. 



In fields and on roadsides. New York to South Dakota, south to North Carolina and Arkansas. 

 Summer. Hare's Ear. 



15. TREPOCARPUS Nutt. 



Annual caulescent herbs, with glabrous foliage. Leaves alternate : blades pinnately 

 decompound, the segments slender. Flowers mostly perfect, in compound umbels. 

 Sepals unequal. Petals broadest above the middle, inflexed at the apex. Disk with a 

 short conic stylopodium. Fruit crustaceous, elongated, laterally flattened : carpels with 4 

 secondary ribs, the primary ribs wanting : oil-tubes solitary under the secondary ribs. 



1. Trepocarpus Aethiisae Nutt. Stems 1-10 dm. tall, branched : leaf-blades 5-10 cm. 

 long, finely dissected, the lower ones with petioles about equal to them in length, the upper 

 short-petioled, the segments narrowly linear, entire or incised : umbels com^monly long-pe- 

 duncled : rays 2-5, becoming 1-2 cm. long : flowers few in each umbellet': fruit oblong, 

 8-10 mm. long, sharply ribbed. 



On prairies, Arkansas and the Indian Territory to Louisiana and Texas. Spring and summer. 



16. APIUM L. 



Annual or perennial caulescent herbs. Leaves alternate : blades pinnate or ternately 



decompound : leaflets toothed or incised. Flowers in compound umbels. Involucres 



present or wanting. Hypanthium truncate or nearly so. Petals white, broad, inflexed at 



the apex. Fruit somewhat latterly flattened, smooth or tuberculate : carpels 5-angled or 



ribbed with 1 oil-tube in each interval or two in the inner face. Seeds terete or slightly 



angled. 



Leaf-blades ternately divided into filiform entire segments. 1- A. Ammi. 



Leaf-blades pinnately divided into broad-toothed segments. 2. A. nodiflorum. 



1. Apium Ammi (L. ) Urban. Stems erect, 1-6 dm. tall, more or less branched : 

 leaf-blades ternately divided ; segments filiform or narrowly linear, acute : corolla white, 



