PENNELL: THE SPECIES OF KNEIFFIA 373 
PENIOPHYLLUM?* Pennell, gen. nov. 
Slender glabrous herb, with virgately branched stem. Leaves 
of two forms, the basal petioled, ovate, less than 2 cm. long, the 
numerous stem-leaves scattered, filiform-linear to filiform, longer. 
Flowers in spikes terminal on the stem and branches. Bracts 
deltoid-ovate to ovate, shorter than the capsules. Sepals partially 
cohering, reflexing in two pieces. Petals about 4 mm. long, tri- 
angular. Filaments unequal, glabrous. Anthers oblong, glab- 
rous. Style glabrous. Stigma broad, capitate, the four lobes 
scarcely or not distinguishable. Capsule 4-6 mm. long, ellipsoid, 
sharply 4-angled, not stipitate. Seeds angled, brown, I mm. 
long, irregularly clustered. 
Type species, Oenothera linifolia Nutt. 
1. Peniophyllum linifolium (Nutt.) Pennell, comb. nov. 
Oenothera linifolia Nutt. Jour. Acad. Nat. Sci. Phila. 2: 120. 
1821. ‘Habitat: On the summits of arid hills and the shelv- 
ings of rocks, near the banks of the Arkansas [T7.. Nuttall].” 
Specimen, labeled ‘‘Arkansa, Nuttall,’’ seen in herbarium 
of Columbia University at the New York Botanical Garden. 
Kneiffia linifolia Spach, Nouv. Ann. Mus. Par. 4: 368. 1835. 
Kneifiia linearifolia Spach, Ann. Sc. Nat. Bot. II. 4: 167. 1835. 
Based upon Oenothera linifolia Nutt. 
Sandy soil, prairies and open woodland, southern Missouri 
and Kansas south to western Louisiana and eastern Texas; also 
on granite in central Georgia and central Alabama. 
NEw York BOTANICAL GARDEN 

* From rnvior, thread, and $vAdor, leaf. 
