PLANT SUCCESSION AND RANGE MANAGEMENT. 
57 
perennial plants on both of these protected plots, low larkspur has 
increased proportionately much more rapidly than any other ; on the 
outside range the colonization of the low larkspur has been only 
moderately rapid and in proportion to that of other perennial plants. 
This difference in aggressiveness of larkspur is accounted for by 
the fact that the unprotected range is grazed b}^ sheep prior to seed 
maturity. 1 As larkspur is fairly palatable to sheep, only a small pro- 
r"""Fr;7""7 
;™ Tq] x"c" 
La Lf ,l La 
x C ) 5 \\ C j 
C - v/l ©} 5 v 
x Vi ! x 
v (c J © 
c It x c 
F 
X 
c 
V 
Y l ' 
X,V & ' T 
V I v La ! 
I 
cTx 
i x I I — / * 
* X 
C T 
Y « 
VT 
I XIX 
, x! v C C |C T 
*fe— * * #U* 
* 5 C 
La x 
C Y 
X 
Y 5 Yl 
l * Y | X Y 
^ « ! Y ^s Y 
X © 
AY X 
T <4^ i « S 
T 5] Y © „ C JS T 
S c 
CCe 
Y C Y @j!^T 
(a g / [x © 
_ Y. &• .C 5 
T Y 
S 
rrrr 
© 
c t' 
X (C 
La C 
II 
f?S>T§Q I L°. N . J'i-. .' 1 
© 
' C X U 
*C T c 
X T 
Y X e Y 
B — Large mountain brome grass (Bromus 
marginatum) . 
C — Slender-leaved collomia {Collomia lin- 
earis). 
D — Low larkspur (Delphinium menzicsii) . 
E — Sweet sage (Artemisia discolor). 
P — Spiked fescue (Festuca confines). 
L — Low pea vine (Lathyrus leucanthns) . 
La — Evening primrose (Lavauxia fiava). 
N — Chickweed (Alsine jamcsiana) . 
— X — X — Fence. 
S — Tansy mustard (Sophia incisa). 
Sa— Mountain elder (Samoucus microoot- 
rys). 
T — Dandelion (Leontodon taraxacum). 
Th — Meadow rue (Thalictrum fcndleri). 
V — Tongue-leaved violet (Viola linguae- 
folia). 
X — Douglas knotweed (Polygonum doug- 
lasii). 
Y — Plantain (Plantago tweedy i). 
. . Dry gully. 
P — Blue foxglove (Pentstcmon procerus). 
Pig. 22. — Character of vegetation on a formerly depleted stock driveway in process of 
recuperation. 
portion of the seed crop is matured on the open range, whereas maxi- 
mum seed production is secured on the protected area. Being small, 
comparatively heavy, and without special contrivances favoring dis- 
tribution by wind or attachment, the seeds drop near the parent plant, 
where they give rise to new individuals. 
Like certain other species previously discussed, low larkspur holds 
a more or less conspicuous place in the development of the vegetation 
1 Most larkspurs are grazed with moderate relish by sheep, and, so far as known, with- 
out serious results. 
