Wednesday, October 24, 2012

French Joe Canyon – A Limestone Hike and a Rarity at the End


 
This past Saturday I did a short botanizing/birding/bugging hike up French Joe Canyon east of Tucson with my friend Greg Corman. Greg, owner of Gardening Insights is a botanist, landscape designer and artist who has been with me to Bolivia a couple times on our “birds & botany” tours. We could have spent all day in a just 100 meters of the canyon, but I was itching to get the "upper spring."

French Joe is a special place. Just south of Kartchner Cavers State Park, it drains eastward out of the Whetstone Mountains, a largely limestone uplifted range. It became famous among birders in 1995 when John Martin found a singing, territorial Rufous-capped Warbler in the upper part of the canyon, a good mile hike after a very rough entry in a high-clearance vehicle. That same year a second territorial bird was found, and then in subsequent years a lone male continued, and then after a couple years was then joined by a female, and they bred for a few years until the upper spring dried up in the early oughts.

On the rough drive in, I yelled for Greg to stop for a lizard – and I was able to sneak up and get a closeup of this juvenile Eastern Collared Lizard.


We stopped just before the end of the road, as the last 100 meters or so passes through a lovely woodland, the Western Soapberry thickets adding some authentic fall color.


The slope, exposure, drainage, and geology all conspire to make this a very interesting place botanically, reflected very closely in the invertebrate life as well. In the understory of the lower copse is a healthy patch of Arizona Orange, Choisya dumosa var. arizonica, a member of the rue family (same as citrus).


The variety of composites (plants in the family Asteraceae) had me on my toes. I keyed out seven, using the only key that has all the species: the dreaded Kearney & Peebles. The first one I tackled had me in a tizzy, as it just wouldn’t key out. It turns out there is a fatal error in the already atrocious dichotomous key in this ancient, utterly illustration-free tome (1960). If you happen to have a Coreocarpus without any pappus on the achene, you’re out of luck; that genus does not appear in the key for Asteraceae with ray flowers and no pappus. But I persevered, tried other keys, and arrived at: Little Lemonhead, Coreocarpus arizonicus var. arizonicus. This one is populated by the pretty little buprestid beetle Acmaeodera amabilis.


The rest:

Gumhead, Gymnosperma glutinosum


Harweg's Pricklyleaf, Thymophylla pentachaeta var. hartwegii


Lavender Thoroughwort, Fleischmannia pycnocephala


Thurber's Sneezeweed, Helenium thurberi


Long-stalked Greenhead, Thelesperma longipes


Wright's Thimblehead, Hymenothryx wrightii


I do key out other plants from time to time. This is Ipomoea cristulata, Transpecos Morningglory, this individual notable for having sprouted, put out one pair of true leaves above the cotyledons, and bloomed. Hurry!


Broom Milkwort, Polygala scoparioides from the odd family Polygalaceae. I once tried to key one out in the pea family and nearly killed myself (and everyone else in the room). Then I figured maybe it wasn't a pea.


I had no idea we had another ceanthous here in SE Arizona. Desert Ceanothus, Ceanothus greggii var. perplexans


For a brief dip into Animalia, we saw a few Arizona Giant-Skippers, Agathymus aryxna
Jim Brock informs me that this is Poling's Giant-Skipper, Agathymus polingi, after all. That's the one I had been hoping to see!


I recognized this caterpillar as one of the dull hooded owlet moths. It looks a lot like an eastern species (Cucullia convexipennis), but the wizards at bugguide.net haven’t chimed in yet: Cucullia sp. Lovely in any event. Stay current with my buggguide post here.


Oh, I almost completely forgot: once we got to the upper spring, where bird activity was very quiet, we found that there was some surface water in one pool where 10 years ago there had been a trickling stream. Better than nothing (the rest of the canyon was dry, save for one pool in the lower woodland). So I pished and imitated Western Screech-Owl, hoping to attract something more than the 2 or 3 Chipping Sparrows that had come in for a drink. In came more Chipping Sparrows, a Bridled Titmouse, a pair of Bewick’s Wrens, a couple Ruby-crowned Kinglets, a Hermit Thrush in the undergrowth (they love the sumac berries in abundance here), and then on top of a bush over the pool a yellow-breasted bird. I didn’t even lift my binoculars and got Greg to look – a Rufous-capped Warbler! There hadn’t been one reported from here since August 2008, and before that, May 2004. Has there been one in residence ever since John’s discovery in 1995? The Rufous-cap came in quietly, briefly appeared wren-like in the middle of the bushes only 4 feet in front of us, and moved on. What a thrill.

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