Three other treatments, not part of the initial design, 

 were evaluated as part of this study. Early- and late- 

 season treatments of 2,4-D (2 kg aiTha) were initiated 

 using a backpack sprayer as described above. The 

 early-season treatment occurred in June 1981; the 

 late-season treatment occurred in July 1983. These 

 plots were immediately adjacent to the other herbicide 

 plots. No baseline or interim data were collected for 

 these treatments. The disc chaining treatment was 

 completely independent of all preceding treatments 

 and occurred in the drainage immediately west of the 

 Boulger study area in September 1985. A large an- 

 chor chain with discs welded to the links was pulled 

 in a loop behind a tracked tractor. A two way chain- 

 ing across the contour of the slope provided a treat- 

 ment that knocked down the standing crop and dis- 

 rupted the rhizome layer of false hellebore. As with 

 the 2,4-D treatments, no pretreatment baseline or 

 interim data were collected for this treatment. For 

 treatments where baseline data were not taken, the 

 baseline was assiimed to be 16.8 false hellebore stems 

 per square meter, based on the average baseUne popu- 

 lation density for the Boulger study treatments. 



For data collection, each 15- by 15-m treatment plot 

 was subdivided into quarters and each quarter was 

 sampled independently. Transect lines were located 

 in the center of the treatment plot and ran the length 

 of each quarter plot. Data were recorded from five 

 0.25-m^ sample quadrats distributed at regular inter- 

 vals along each transect within each quarter plot. 

 Stem density co\ints for false hellebore were recorded 

 in 1983, 1984, and 1986. Stem density for false helle- 

 bore and nested frequency data for all herbaceous 

 species were recorded in 1991. 



Nested frequency data were analyzed for the 16 

 species encountered often enough to allow compari- 

 sons. These data were collected at the same time as 

 the density counts. The 0.25-m^ sample quadrat had 

 four divisions of increasing size. A species occurring 

 in the smallest division received a score of 4, while 

 those occurring first in the other divisions received 

 a score of 3, 2, or 1, respectively, as the size division 

 increased. No attempt will be made in this report to 

 synthesize conclusions on a species-by-species analy- 

 sis of the nested frequency data. The data are available 

 in table 1 for treatment-by-treatment and species-by- 

 species analysis that may be useftd for other objectives. 



Table 1 — Nested frequency scores by treatment and species for early 1980's false hellebore treatments in Boulger Canyon. Values preceded by the same 

 letter are not significantly different within a row; values followed by the same letter are not significantly different within a column 



Treatment 



Species Amitrole Picloram Glyphosate Triclopyr 2,4-D early 2,4-D late Cutting 



Rototllling Disc chaining 



Veratrum be 8.8 def bcd10.3 ef be 8.5 ef be 9.5 ef b 8.0 cd 

 californicum 



Descurainia a 0.0 a e 5.3 bed be 4.3 abede d 9.8 ef be 3.8 abe 

 pinnata 



Thalictrum 310.8 fg ab 0.8 a d 6.8 cdef abc 2.8 abe cd 4.3 abe 

 fendleri 



Viola ab 8.8 def a 3.8 abe a 7.5 def a 3.0 ab a 6.3 be 

 purpurea 



Bromus ab 9.3 def bc14.0 g bc14.0g c16.5g a 6.5 be 



carinatus 



Agropyror) de12.5 g e13.0fg ede 9.3 f be 7.5 de de12.0d 

 trachycaulum 



Galium a 0.3 ab abc 1 .8 a abc 2.5 abc d 11 .5 f c 6.5 be 

 boreale 



Helenium cd 7.3 de ab 1 .3 a ab 1 .8 ab a 0.0 a a 0.5 a 

 hoopesii 



Stipa be 4.8 cd e 6.3 cd abc 2.8 abc ab 2.3 ab abc 3.8 abc 

 Columbiana 



Rudbeckia abe 3.0 be abe 3.5 abc be 4.0 abede e 6.3 ede abc 2.8 abe 

 occidentalis 



Hackelia a 0.0 a ab 1 .5 a ab 3.0 abed e 7.0 de ab 0.8 a 

 floribunda 



Polemonium ab 5.3 cd ab 3.5 abe ab 6.0 bedef ab 5.3 bed ab 4.3 abe 

 foliosissimum 



Poa ab 1.8 ab c 8.0 de c 6.8 cdef c 5.0 bed c 6.8 bed 

 reflexa 



Phacelia a 0.0 a a 1 .5 a a 0.0 a ab 2.5 ab ab 2.3 ab 

 hastata 



Madia a 0.0 a a 2.5 ab a 0.0 a a 0.0 a a 4.3 abc 

 glomerata 



Stipa elO.O efg a 2.5 ab ab 3.0 abed a 0.0 a ab 3.0 abc 

 lettermani 



bcd10.3de cd13.3 h a 3.0 abed ab 7.3 def 



abc 2.8 ab ab 1.5 ab be 3.8 abed dIO.Of 



ab 1 .5 ab d 6.8 efg a 0.5 abc abc 2.3 abc 



a 2.3 ab ab 7.8 fg a 5.8 de a 3.5 abed 



a 5.8 bed a 8.0 fg a 5.5 de a 8.3 ef 



e13.0 e bed 8.5 g ab 4.5 bed be 6.8 cdef 



be 4.0 ab abc 1 .8 abc c 4.5 bed ab 0.8 ab 



ab 1.3 ab be 4.8 bedef ab 1.5 abed dIO.Of 



a 0.3 a be 5.0 cdef be 4.8 ede abe 3.8 abede 



ab 0.3 a e 5.8 defg a 0.0 a abe 2.8 abed 



ab 2.0 ab ab 3.3 atx:d a 0.0 a ab 3.0 abed 



ab 2.3 ab b 6.8 efg a 1 .0 abc ab 4.8 bcde 



e 5.5 bed be 4.3 bcde a 0.3 ab a 0.0 a 



b 5.3 abed a 0.5 a e13.0f a 0.0 a 



b 9.5 ede a 0.0 a c18.8g a 0.0 a 



b 4.8 abc ab 2.5 abed c 9.0 ef a 0.0 a 



2 



