AMMIACEAE 867 



less than 1 mm. broad : fruit oval or ovoid-oval, 1.5-2 mm. long, prominently ribbed. [A. 

 leptophyllum (DC.) F. Muell.] 



In sandy soil, New Jersey and Missouri, south to Florida and Texas. Widely distributed in trop- 

 ical countries. Spring and summer. MARSH PARSLEY. 



2. Apium nodiflorum (DC. ) B. & H. Stems prostrate, often creeping, 3-7 dm. long, 

 sparingly branched : leaf-blades pinnately compound, 5-10 cm. long ; leaflets oblong, ovate- 

 lanceolate or lanceolate, serrate, mostly acute : umbels opposite the leaves, 1.5-3 cm. broad, 

 short-peduncled : bractlets of the involucels 5-6 : corolla white, about 1 mm. broad : fruit 

 oval or orbicular-oval, about 2 mm. long. 



In ditches and waste places, near Charleston and other seaport towns. Introduced from Europe. 

 Spring and summer. 



17. SPERMOLEPIS Kaf. 



Annual herbs, with erect slender branching stems. Leaves alternate : blades dissected 

 into narrow segments. Flowers in compound umbels. Involucres wanting. Involucels 

 of a few narrow bracts. Hypanthium truncate. Petals white. Disk with a thick conic 

 stylopodium. Fruit somewhat laterally flattened, tuberculate or bristly : carpels with 5 

 prominent or obsolete ribs between which is a single oil-tube, except in the inner side where 

 there are two. Seeds angled. [Leptocaulis Nutt.] 



Fruit tuberculate, broadest at the middle, the ribs rather prominent. 1. S. divaricatus. 



Fruit with hooked hairs, broadest above the middle, the ribs obsolete. 2. S. echinatus. 



1. Spermolepis divaricatus ( Walt. ) Kaf. Stems 1-6 dm. tall, often widely 

 branched, sometimes diffusely so, the branches very slender or nearly filiform : leaf-blades 2- 

 8 cm. long, twice or thrice pinnately parted ; segments narrowly linear or filiform : corolla 

 white, about 1 mm. broad : fruit broadest about the middle, about 1 mm. long, tuberculate, 

 prominently ribbed. 



In sandy soil and on prairies, Missouri and Kansas to North Carolina, Florida and Texas. Spring. 



2. Spermolepis echinatus (Nutt. ) Heller. Stems 1-5 dm. tall, more or less diffusely 

 branched : leaves 1-6 cm. long ; blades twice or thrice pinnately parted ; segments narrowly 

 linear or filiform : umbels slender-peduncled, 1.5-4 cm. broad : rays slender, more or less 

 variable in length : corolla white, less than 1 mm. broad : fruit broadest below .the middle, 

 2 mm. long, covered with hooked bristles, the ribs obsolete. 



In dry soil, Missouri to California, Alabama and Texas. Spring. 



18. AMMOSELINUM T. & G. 



Annual caulescent diffuse herbs. Leaves alternate : blades ternately dissected. Flow- 

 ers perfect in compound umbels. Involucres and involucels of several entire or dissected 

 bracts. Hypanthium truncate or nearly so. Petals white, broadest above the middlCj 

 often nearly flat. Disk with a short conic stylopodium. Fruit longer than broad : carpels 

 terete or slightly laterally flattened, with 5 prominent ribs which are tuberculate or spiny' : 

 oil-tubes solitary in the intervals and 2 in the inner side. SAND PARSLEY. 



Plant nearly grabrous : fruit 2 mm. long. 1. A. Butleri. 



Plant manifestly scabrous : fruit 4-5 mm. long. 2. A. Popei. 



1. Ammoselinum Butleri (Engelm. ) Coult. & Rose. Plant nearly glabrous. 

 Stems branched from the base ; branches spreading or ascending, 0.5-1 dm. long, zigzag : 

 leaf-blades 1-2 cm. long, the lower ones long-petioled, the upper sessile ; segments nar- 

 rowly oblong or spatulate : umbels small, 5-15 mm. broad : bracts similar to the leaves 

 but smaller : rays 3-6, unequal : corolla about 1 mm. broad : fruit oblong or ovate-oblong, 

 2 mm. long, the ribs prominent, more or less scabrous. 



In wet soil, Missouri and the Indian Territory, south to Texas. Spring. 



2. Ammoselinum Popei T. & G. Foliage manifestly scabrous. Stems usually 

 branching from the base ; branches spreading or ascending, 1-3 dm. long : leaf -blades 1-4 

 cm. long, dissected, the lower ones slender-petioled, the upper sessile ; segments linear 

 or linear-oblong : umbels sessile or on short stout peduncles : bracts usually smaller than 

 the leaves : rays 2-5, stiff, 0.5-2.5 cm. long : sepals oblong: corolla about 1 mm. broad : 

 fruit ovate-oblong, 4-5 mm. long, the ribs more or less sharply tuberculate. 



In sandy soil, Missouri and Kansas to Texas and New Mexico. Spring. 



19. ZIZIA Koch. 



Perennial caulescent herbs. Leaves alternate : blades 3-foliolate or ternately compound 

 or the basal ones sometimes simple. Flowers in compound umbels, the central umbellet 



