1924] Penland,—Notes on North American Scutellarias 65 
tion) comes between the others, both from a superficial standpoint 
and from the characters of the nutlets. S. lateriflora has small papillae 
or wart-like protuberances on the surface of the achene, while S. 
epilobiifolia has the surface of the achene merely scabridulous. 
The European S. galericulata has nutlets closely resembling those of 
5. lateriflora, while the vegetative characters are very similar to those 
of S. epilobiifolia. The corolla of the latter exceeds by about 1 cm. 
that of S. galericulata, which attains a length of no more than 1.5 em. 
From this comparative examination, based on reproductive characters, 
it would seem anything but following the natural system to break off 
S. lateriflora and put it into a separate section as both Bentham and 
Briquet have done. 
I desire to record my thanks to Prof. M. L. Fernald, who has 
supervised this work and given invaluable advice; to Dr. B. L. Robin- 
son, Dr. J. M. Greenman, and Mr. Bayard Long, for the loan of 
herbarium material of their respective institutions; to Miss Mary 
A. Day and other members of the Gray Herbarium staff for help 
rendered along various lines during the execution of the work. 
The key, based upon nutlet-characters, is artificial, since, as already 
explained, species which seem to have come through different lines 
of descent are thrown together. In the citation of specimens all 
which are not in the Gray Herbarium are indicated by initials in 
parentheses: N, Herbarium of New England Botanical Club; M, 
Missouri Botanical Garden; P, Academy of Natural Sciences of Phila- 
delphia. 
ANALYTIC KEY BASED ON NUTLET-CHARACTERS.! 
A. Nutlets banded or winged, or conspicuously compressed 
dorso-ventrally B. 
B. Nutlets conspicuously winged C. 
C. Nutlets not over 1 mm. in diameter; wing more or less 
median D. 
D. Nutlets with muriculate papillae; wing relatively wide 7. S. nervosa. 
D. Nutlets with bluntish papillae; wing relatively narrow 6. S. parvula. 
C. Nutlets mostly over 1 mm. in diameter; wing somewhat 
basal, giving the nutlet a flattened appearance E. 
E. Nutlets with relatively narrow, unexpanded and non- 
Bea Das WIDZS. ue e Mi 8. S. angustifolia. 
E. Nutlets with very wide, membranaceous wings. 9. S. antirrhinoides, 
B. Nutlets mostly merely compressed, never with conspicu- 
ous wings I. : 
I. Nutlets dull yellow or grayish, with somewhat conical 
| COMMENCEMENT Pis 11. S. nana. 
1 In the absence of mature nutlets some species have to be omitted from this key. 
Though in the succeeding descriptions they are placed in what appears to be their 
natural sequence. 
