how many additional years will the rocky mountains (scopulorum) subspecies of p. ponderosa needles remain green compared to pacific (critchfieldiana)?
1.8 years
col : common names\nsubspecies | pacific\n(critchfieldiana) | columbia\n(ponderosa) | rocky mountains\n(scopulorum) | southwestern\n(brachyptera) | central high plains\n(readiana) row 1 : years needles remain green | 3.9±0.25, n=30 | 4.7±0.14, n=50 | 5.7±0.28, n=23 | 4.3±0.18, n=24 | 4.7±0.18, n=5 row 2 : foliage length on branch, cm | 25.1±2.4, n=30 | 26.2±2.2, n=50 | 21.1±1.7, n=23 | 21.8±2.7, n=24 | 42.2±6.7, n=5 row 3 : needle length, cm | 19.8±0.44, n=30 | 16.8±0.29, n=48 | 11.2±0.27, n=23 | 14.7±0.45, n=24 | 15.6±0.57, n=5 row 4 : needles per fascicle | 3.0±0.00, n=30 | 3.0±0.00, n=48 | 2.6±0.06, n=23 | 3.0±0.03, n=24 | 2.4±0.11, n=5 row 5 : needle thickness | 45.9±0.49, n=30 | 47.8±0.51, n=48 | 46.4±0.68, n=23 | 44.8±0.87, n=24 | 49.7±0.61, n=5 row 6 : branches per whorl | 4.4±0.13, n=30 | 3.7±0.11, n=50 | 3.0±0.17, n=23 | 3.4±0.25, n=23 | 2.3±0.11, n=5 row 7 : branch angle ° from vert. | 56±1.8, n=30 | 51±1.7, n=50 | 50±2.3, n=23 | 48±3.1, n=24 | 36±1.9, n=5 row 8 : seed cones length, mm | 101.4±2.48, n=25 | 88.7±1.24, n=36 | 70.7±2.20, n=22 | 74.9±2.51, n=20 | 71.1±2.46, n=5 row 9 : seed cones width, mm | 77.1±1.35, n=25 | 71.6±0.73, n=36 | 61.5±1.08, n=22 | 62.6±1.77, n=20 | 63.3±2.18, n=5 row 10 : seed cone form w/l | 0.80±0.03, n=25 | 0.84±0.03, n=36 | 0.90±0.02, n=22 | 0.86±0.02, n=20 | 0.90±0.03, n=5 row 11 : seed length, mm | 7.5±0.08, n=23 | 7.6±0.16, n=14 | 6.3±0.09, n=17 | 6.4±0.18, n=16 | 7.0±0.12, n=5 row 12 : seed width, mm | 4.9±0.05, n=23 | 4.9±0.08, n=14 | 4.1±0.05, n=17 | 4.3±0.09, n=16 | 4.5±0.10, n=5 row 13 : seed + wing length, mm | 32.3±0.58, n=23 | 24.8±0.62, n=14 | 22.9±0.63, n=17 | 23.3±0.68, n=15 | 23.1±0.78, n=5 row 14 : mature cone color | apple green to yellow green | green & red-brown to dk. purple | green & red-brown to dk. purple |  | green & red-brown to dk. purple
how many additional years will the rocky mountains (scopulorum) subspecies of p. ponderosa needles remain green compared to pacific (critchfieldiana)?
Common names\nSubspecies Pacific\n(critchfieldiana) Columbia\n(ponderosa) Rocky Mountains\n(scopulorum) Southwestern\n(brachyptera) Central High Plains\n(readiana)
Years needles remain green 3.9±0.25, N=30 4.7±0.14, N=50 5.7±0.28, N=23 4.3±0.18, N=24 4.7±0.18, N=5
Foliage length on branch, cm 25.1±2.4, N=30 26.2±2.2, N=50 21.1±1.7, N=23 21.8±2.7, N=24 42.2±6.7, N=5
Needle length, cm 19.8±0.44, N=30 16.8±0.29, N=48 11.2±0.27, N=23 14.7±0.45, N=24 15.6±0.57, N=5
Needles per fascicle 3.0±0.00, N=30 3.0±0.00, N=48 2.6±0.06, N=23 3.0±0.03, N=24 2.4±0.11, N=5
Needle thickness 45.9±0.49, N=30 47.8±0.51, N=48 46.4±0.68, N=23 44.8±0.87, N=24 49.7±0.61, N=5
Branches per whorl 4.4±0.13, N=30 3.7±0.11, N=50 3.0±0.17, N=23 3.4±0.25, N=23 2.3±0.11, N=5
Branch angle ° from vert. 56±1.8, N=30 51±1.7, N=50 50±2.3, N=23 48±3.1, N=24 36±1.9, N=5
Seed cones length, mm 101.4±2.48, N=25 88.7±1.24, N=36 70.7±2.20, N=22 74.9±2.51, N=20 71.1±2.46, N=5
Seed cones width, mm 77.1±1.35, N=25 71.6±0.73, N=36 61.5±1.08, N=22 62.6±1.77, N=20 63.3±2.18, N=5
Seed cone form W/L 0.80±0.03, N=25 0.84±0.03, N=36 0.90±0.02, N=22 0.86±0.02, N=20 0.90±0.03, N=5
Seed length, mm 7.5±0.08, N=23 7.6±0.16, N=14 6.3±0.09, N=17 6.4±0.18, N=16 7.0±0.12, N=5
Seed width, mm 4.9±0.05, N=23 4.9±0.08, N=14 4.1±0.05, N=17 4.3±0.09, N=16 4.5±0.10, N=5
Seed + wing length, mm 32.3±0.58, N=23 24.8±0.62, N=14 22.9±0.63, N=17 23.3±0.68, N=15 23.1±0.78, N=5
Mature cone color apple green to yellow green green & red-brown to dk. purple green & red-brown to dk. purple green & red-brown to dk. purple
1.8 years