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 nodiflórum (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 Raf. 
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 isa 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.) Raf. Stems 1-6 dm. tall, often widely 
branched, sometimes diffusely so, the branches very slender or nearly filiform : leaf-blades 2- 
8cm. 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 middle, 
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. . l. A. Butleri. 
Plant manifestly scabrous: fruit 4-5 mm. long. 2. A. Popei. 
1. Ammoselinum Bütleri (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 Pópei 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 uncles: 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 
