Fig. 1 shows the difference between A. parryana and A. patula for the hairs and glands of the nascent inflorescence. We've been confused in the past by observing glints in sunlight from A. parryana, and had called those plants A. parryana gold in the following text from the year 2002. We still don't know what causes those glints, but those plants are solidly A. parryana, since the hairs of the nascent inflorescence looking nothing like the heavily-glandular ones of A. patula.
Text from 2002:
We have begun a project to map the spatial distribution of the manzanita species in the San Gabriel Mountains. The following plots give the data we have gathered so far.
We have kept separate the few A. parryana specimens that look mostly like A. parryana, but have a few golden-gland-tipped hairs.
It is interesting to compare what we have found so far with the elevation ranges given in Munz and JM (all elevations in feet):
Species | Munz | JM | Us So Far |
---|---|---|---|
A. gabrielensis | - | ± 5000 | 4930 |
A. glandulosa ssp glaucomollis | - | 2000-6000 | 2560-3520 |
A. glauca | below 4500 | below 6200 | 2940-5980 |
A. parryana | 4000-7500' | 4000-7800 | 3750-7250 |
A. patula | 5000-9000 | 2500-11,000 | 6607-9138 |
Just for fun, we identified the locations of all A. patula plants along the trail from Dawson Saddle to Throop Peak. Each point in the following plots represents either an individual A. patula specimen along the trail, or all specimens within 0.01-0.02 miles of that point. I.e., the long stretches of trail without any plotted A. patula points do not contain any A. patula specimens along the trail, and closely-spaced A. patula points should usually simply be connected with a straight line, indicating that many specimens are found in those locations.
A. patula distribution along the Dawson Saddle to Throop Peak trail: spatial coordinates (map) and elevation vs. longitude plot.
The following table gives the locations used in the large-scale plots:
patula 34.36182 242.1306 -117.8694 6607 ne corner of williamson trailhead parking lot 34.35683 242.14995 -117.85005 6660 islip saddle parking lot, across the street from the bathroom 34.36149 242.12782 -117.87218 6720 mp 62.26 near mt. williamson trailhead 34.35866 242.12402 -117.87598 6730 williamson rock parking lot 34.34469 242.07995 -117.92005 6750 mt. waterman trailhead (mp 58.02) 34.3677 242.19996 -117.80004 7956 on dawson saddle trail 34.36724 242.19782 -117.80218 8083 on dawson saddle trail 34.36496 242.19646 -117.80354 8169 on dawson saddle trail 34.36046 242.19496 -117.80504 8373 on dawson saddle trail 34.35785 242.19749 -117.80251 8483 on dawson saddle trail 34.3543 242.19809 -117.80191 8671 on dawson saddle trail 34.35221 242.20388 -117.79612 8887 pct just s of dawson saddle trail 34.35047 242.20168 -117.79832 9138 throop peak parryana 34.30271 242.4859 -117.5141 3752 parryana begins here, 1.8 miles from beginning of lone pine canyon road at bottom, near sr2 34.27286 241.9559 -118.0441 4580 Parryana started at Barley Flats/Shortcut Saddle on sr2 34.39183 241.9187 -118.0813 4930 mill creek summit 34.32679 241.99573 -118.00427 5280 chilao visitor center 34.29711 241.97222 -118.02778 5908 Vetter 34.38222 242.22146 -117.77854 5980 manz trail 34.34937 241.98509 -118.01491 6162 Hillyer 34.36685 242.3459 -117.6541 6206 just west of wrightwood on sr2 34.36495 242.25702 -117.74298 6340 bhmt 34.37491 242.27923 -117.72077 7250 just west of grassy hollow (we need to double-check this one) glandulosa ssp glaucomollis 34.19588 241.97331 -118.02669 2560 cabin site on san olene fire road, near chantry flats 34.21589 241.87027 -118.12973 3100 approximate position on sunset ridge road, above camp sierra 34.29532 241.83298 -118.16702 3289 glandulosa and glauca at stop 5 8/5/02 afh 34.21323 241.97207 -118.02793 3420 approximate position on mt. zion trail 34.2727 241.84206 -118.15794 3520 the Pines Picnic Area on AFH near Clear Creek glauca 34.25803 241.80802 -118.19198 2940 CCC Ridge on ACH 34.21699 241.86673 -118.13327 2950 near camp sierra on sunset ridge trail 34.29886 241.85232 -118.14768 3040 5 glauca at stop 2 8/5/02 afh 34.29532 241.83298 -118.16702 3289 glandulosa and glauca at stop 5 8/5/02 afh 34.26666 241.85678 -118.14322 3340 switzers 34.27908 241.83216 -118.16784 3360 5 glauca at stop 1 8/5/02 afh 34.30582 242.49638 -117.50362 3667 glauca begins here, 1.0 miles from beginning of lone pine canyon road at bottom, near sr2 34.30751 242.4724 -117.5276 4045 2.7 miles from beginning of lone pine canyon road at bottom, near sr2 34.38548 241.90333 -118.09667 4509 only glauca at stop 3 8/5/02 afh 34.25833 241.89579 -118.10421 4666 Red Box 34.39156 241.91927 -118.08073 4918 forma eremicola at mill creek summit 34.38222 242.22146 -117.77854 5980 manz trail gabrielensis 34.39183 241.9187 -118.0813 4930 mill creek summit parryana with some gold hairs 34.34248 242.01542 -117.98458 5840 mp 52.63 near three points 34.38222 242.22146 -117.77854 5980 manz trail
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Copyright © 2002-2014 by Jane Strong and Tom Chester.
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Updated 11 July 2014