Oakmead Herbarium home | Arrivals, Weeds | Floristic References | Place Names | Maps and Vegetation Surveys

 

Native & Naturalized Vascular Plants – Comparative statistics

(source: Status of Vascular Plants: A report produced as part of the State of the Preserve assessment, 2008).

 

 

 

 

California TJM, 1993*

Santa Cruz Mtn Thomas, 1961

Jasper Ridge**

acres

100,000,000

887,039

1,189

taxa

7266

1796

761

genera

1222

650

395

families ***

173

167

98

* T. Rosatti (2005) Jepson Manual Update: Attempting to Quantify the Changes Expected for TJM2. The Jepson Globe 16:1-.

** JRBP taxa include some locally naturalized plants and hybrids not given taxonomic status in TJM or TJM2. Native and naturalized taxa after TJM2 changes as of 2016 is 761 vascular plants for JRBP.

*** Comparison of plant families according to TJM2 (2012) see Phylogentic guide to Jasper Ridge Vascular Plant Families.

 

 

All Vascular Plants documented at Jasper Ridge Biological Preserve

(source: Status of Vascular Plants: A report produced as part of the State of the Preserve assessment, 2008).

 

 

taxa
native

taxa
naturalized

total

% native /
naturalized

% of
total

I. Ferns & Allies 

18

0

18

100.0% / 0%

02.3%

II. Gymnosperms 

2

1

3

66.6% / 33.3%

00.3%

III. Angiosperms

546

221

767

71.3% / 28.7%

97.4%

     Dicots

419

164

583

72% / 28%

74.1%

     Monocots

127

57

184

69% / 31%%

23.3%

Totals I+II+III

566

222

788

72% / 28%

100%

 

 

Comparison of Species Richness (1 sq. m). JRBP data from James Griffin, 1979-1981. Count, standard error, and other details are from Stromberg, M.; Griffin, J. 2001. Composition, Invasibility, and Diversity in Coastal California Grasslands. Madroño 48:236-52.

 

Community name

No. species

CA Coastal Terrace Prairies

22.6

JRBP Serpentine Prairie

17.0

JRBP Blue Oak Woodland

15.5

Monterey Co., Annual Grassland

14.7

Napa Co., Sepentine Meadows

12.3

Napa Co., Non-Sepentine Meadows

10.3

 

 

Naturalized Angiosperms

V = 100 I/S%, where I is the total of introduced taxa, and S is the total number of native and introduced species

 

 

1962

1971

1973

1986

2006

Angiosperms 

I=89 & V=20%

I=108 & V=22%)

I=161 & V=25%

I=175 & V=27%

I=222 & V=28%

1962-1986 figures from Macdonald et al. (1988) Introduced Species in Nature Reserves in Mediterranean-type Climatic Regions of the World. Biological Conservation 44: 37-66.

Invasion Index

                                                                                                                                                                                                                                            

 

 

Comparison of Grass Flora with California Grass Flora in The Jepson Manual (TJM) 1993

 

Poaceae

Jasper Ridge
Preserve

TJM 1993*   

%

Genera

44

117

37%

Taxa (species, subsp, vars)

101

470

21%

*As reported in Table 6 “Comparison of comprehensive surveys of the California grass flora” in James Smith (2014) Field guide to grasses of California, UC Press.

 

Other Jasper Ridge Biological Preserve Grass Statistics

·         47 taxa (46.5%) are annuals (compared with 30% for California).

·         54 taxa (53.5%) are perennials (compared with 70% for California).

·         44 taxa (43.6%) are native (compared with 54.4% for California).

·         57 taxa (56.4%) are naturalized, native to other states or countries, prominently the barnyards of Spain (compared with 45.6% for California).

·         12 taxa are native annuals; 25.5% of all annuals.

·         32 taxa are native perennials; 59% of all perennials.

·         6 taxa are endemic to California plus CFP in SW Oregon and Baja Norte.

·         Arrival dates of some naturalized grasses.

 

 

Major Collectors

Source: JROH Database, may vary slightly from Consortium of California Herbaria (CCH) totals due to lag time from local accessioning to Consortium submission and other CCH database technicalities. John Thomas’ collections exceed the CCH single search maximum default retrieval limit.

 

 

Voucher dates

Number

sheets

Number

Taxa

Thomas, J.H.

1955-1992

3,454

 

Rawlings, J.

2004-

423

267

Corelli, T.

1990-

157

131

Dengler, H.

1957-1982

94

85

Zabel, C.

1989-2007

88

78

Lambrecht, A.

1989-

85

73

Breedlove, D.

1971

70

61

Lennihan, W.

1980-1990

68

52

Dudley, W.R.

1893-1910

53

43

Abrams, L.R.

1898-1934

51

40

 

Oakmead Herbarium home | Arrivals, Weeds | Floristic References | Place Names | Maps and Vegetation Surveys