CORRIGIOLACEAE 399 
FAMILY 4. CORRIGIOLACEAE Reichenb. WmurTLOW-WORT FAMILY. 
Herbs, with firm or rigid tissues and erect or creeping commonly tufted stems. 
Leaves opposite: blades often narrow, entire: stipules scarious, sometimes con- 
spicuous, or rarely wanting. Flowers incomplete, perfect, in clustered or dichot- 
omous cymes. Sepals 4-5, nearly distinct or partly united, white or green, 
persistent. Corolla wanting. Androecium of 4—5 stamens inserted at the base 
of the ovary. Filaments slender. Anthers short, 2-celled. Gynoecium of a single 
pistil. Ovary 1-celled, sessile. Styles wholly or partially united, sometimes very 
short. Ovule solitary. Fruit a utricle or anachene. Seed solitary : endosperm 
nearly surrounding the embryo. [Jllecebraceae Lindl. ] 
Hypanthium wanting or very small: stamens inserted under the ovary at the sepal-bases. 
Calyx sessile in a pair of bracts which simulate the sepals: sepals awned. 1. PARONYCHIA. 
Calyx manifestly pedicelled : bracts simulating the leaves: sepals merely cuspi- 
date on the back, or the cusps wanting. 
Styles relatively long; sepals cuspidate : radicle ascending. 2. ANYCHIASTRUM. 
Styles wanting or nearly so: sepals barely mucronate : radicle descending. 3. ANYCHIA. 
H dum em present, often about as long as the sepals, the stamens inserted near 
its edge. 
Flowers subtended by normal bracts. 
Sepals merely concave: flower not urn-shaped: stems or branches simple 
below. 4. ODONTONYCHIA. 
Sepals with small cusps back of the hoods: flower urn-shaped: stems or 
branches dichotomous throughout. ' 
SIPHONYCHIA. 
Flowers subtended by thick clamp-like involucels. 
GIBBESIA. 
ae 
1. PARONYCHIA Adans. 
Annual or perennial herbs, with stems often branching at the base. Leaves mostly 
opposite: blades narrow. Flowers in clustered or dichotomous cymes. Calyx persistent. 
Sepals 5, narrow, concave or hooded at the awn-tipped apex. Stamens 5, included : fila- 
ments inserted at the base of the ovary, alternating with 5 small staminodia. Styles 
partially united. Utricle included. Seed resupinate. The plants flower in the sum- 
mer and fall. WmuiTLOW-WORT. 
Annual or biennial: sepals dilated at the apex. 
Leaf-blades fully 2 mm. broad. 1. P-"Drummondii. 
Leaf-blades less than 2 mm. broad. 
Foliage pubescent. 
Calyx surpassing the bracts: awns spreading at maturity, much shorter 
than the sepals. 2. P. chorizanthoides. 
Calyx shorter than the bracts: awns erect or ascending, about as long 
.., as the sepals. 3. P. setacea. 
Foliage glabrous, sometimes slightly scabrous. 4. P. Lindheimeri. 
Perennial: sepals not dilated at the apex. 
Calyx glabrous or merely puberulent. > 
Cymes strict, the branches erect or ascending : leaves scabrous. 5. P. scoparia. 
. €ymes open, the branches spreading: leaves smooth. 6. P. dichotoma. 
Calyx manifestly pubescent. 
Calyx exserted beyond;the bracts:and stipules; awns spreading at maturity : 
species campestrian. 
Calyx about 2.5 mm. long: sepals lanceolate, gradually acuminate: 
cymes with ascending branches. 2 7. P. Jamesii. 
Calyx about 2 mm. long: sepals oblong, abruptly acuminate: cymes : 
with divaricate branches. 8. P. Wardi. 
Calyx hidden in the bracts and stipules; awns erect: species Alleghenian. 9. P. argyrocoma. 
l. Paronychia Drummóndii T. & G. Annual or biennial, stoutish, finely pubescent. 
Stem simple below, erect, 1-2 dm. tall, corymbosely branched above : leaf-blades thick, 
oblong or narrowly oblong-spatulate, 1-2 cm. long, over 2 mm. broad, acute, apiculate, 
ciliate, sessile ; stipules lanceolate, long-acuminate, silvery : cymes dense: sepals cuneate, 
1.5 mm. long, with white hoods and short spreading cusps : stamens } as long as the sepals. 
In dry soil, southern Texas. 
2. Paronychia chorizanthoides Small. Annual, slender, minutely pubescent. Stem 
erect, 1-2 dm. tall, forking from a point 3-8 em. above the base : leaf-blades linear-filiform, 
0.8-2 cm. long, less than 2 mm. broad, acute, with a stout midrib, sessile; stipules lanceo- 
late, silvery, acuminate : calyx sessile, 1.5 mm. long, strigose at the base, finally urn- 
shaped, the base much enlarged : sepals ovate or ovate-lanceolate, with a stout midrib, ab- 
ruptly contracted into the ascending cusps which are about } as long as the body at maturity. 
In dry soil, Texas. 
. 3. Paronychia setàcea T. & G. Annual, slender, finely pubescent. Stem erect, 
simple below, forking above, 0.5-1 dm. tall: leaf-blades linear-filiform, 0.5-1.5 em. long, 
