Pine species

Number of needles in a fascicle and number of stomatal rows, mean of 20 needles in this study

Typical length of needles and their longevity; mean length of 20 needles in this study

P. albicaulis

White bark pine

5

9.3

3 - 7 cm, 5 - 8 yrs

4.78 cm

P. attenuata

Knob cone pine

3

24.4

9 - 15 cm, 4 - 5 yrs

12.21 cm

P. coulteri

Coulter pine

3

22.5

16 - 30 cm, 3 - 4 yrs

19.55 cm

P. jeffreyi

Jeffrey pine

3

16.00

12 - 15 cm, 4 - 6 yrs

9.76 cm

P. monophylla

Single leaf pinyon

1

25.8

3 - 6 cm, 4 - 12 yrs

3.75 cm

P. muricata

Bishop pine

2

12.4

7 - 15 cm, 2 - 3 yrs

9.33 cm

P. ponderosa

Ponderosa pine

3

18.7

17 -25 cm, 4 - 6 yrs

15.30 cm

P. lambertiana

Sugar pine

5

?

6 - 11 cm, 2 - 4 yrs

?