126 AMERICAN MIDLAND NATURALIST 
Our species grows in bare, gravelly soil on open prairie hills, 
and was collected on July 2, 1911, by the writer at Pleasant Lake, 
Benson County. The name of the original station suggested the 
species name. 
Antennaria chelonica sp. nov. 
Planta caespites latos integens. Caules maris 4-10 cm. alti, 
feminae graciles, 1-3 dm. alti. Stolones elongati, procumbentes, 
bracteati, apice foliosi, flabelliformes. Folia basilaria firma, cuneato- 
spatulata, indumento laminae superioris laete deciduo. Capitula 
2-5 (plerumque 4), maris conferte condensata, feminae corymbosa 
et longipedicellata. Pedunculi ferme 1-2 cm. longi et ultra Cinter- 
dum usque 13 cm.). Involucra 9-10 cm. alta. Squamae maris 
latae, albae, apice eroso-denticulato, vel propemodum integro, 
feminae lineares vel anguste spatulatae, albidae, subintegrae. Pap- 
pus maris sensim et paullulum apicem versus incrassatus, sub lente 
barbellulatus. 
Plant broadly matted, with male plants 4-10 cm. high, and 
female slender, 1-3 dm. high. Stolons elongated, procumbent, 
bracteate, leafy at the top, flagelliform. Basal leaves firm, cuneate- 
spatulate, the indument disappearing at maturity on the upper side. 
Heads 2-5 (usually 4). Male plants with heads in dense, capitate 
clusters, female heads being corymbose and long-pedicelled. Pedi- 
cels usually 1-2 cm. long or more, sometimes being very long: one 
of my type plants has 4 heads and pedicels respectively 4.5, 5.5, 
6.0 and 13.0 cm. long, arranged on the stem so as to make the in- 
florescence corymbose. Involucres large, 9-10 mm. high. Bracts 
of male heads with broad, white, erose-denticulate or almost entire 
tips ; those of the female plants linear or narrowly spatulate, whit- 
ish, subentire. The male pappus gradually and slightly thickened 
towards the apex, under a hand lens barbellulate. 
This species differs from 4. zeg/ecta Greene and allies in its large 
involucres, its corymbose inflorescence and its long (sometimes 
remarkably long) pedicels. 
The plant grows in green woodland lanes where trees on both 
sides offer an ample shade. This natural condition being by no 
means common, it causes the plant to be quite rare. The type 
specimens were collected by the writer in the middle of June, 1910, 
and 1911, inthe Turtle Mountains of Rolette County, in the vicinity 
of St. John. ‘The species name is derived from Chelone, the Greek 
name for turtle. 
