AZ, Sonoran Desert, 20060406
Tucson, Pima Canyon, flowers.

First few miles of Pima Canyon Trail, including the wash.

Pholistoma auritum arizonicum [] [voucher]

In moist ground near spring along with Mimulus guttatus and the yellow thing below.
GEN ann, delicate
ST long ret gracefully-curved hooked bristles, also some tiny ant uncinate hairs esp near the calyces
LF alt, pin lobed, wide winged petiole that clasps the stem, lobes lance, v hooked bristly and puber
INFL few-fl cymes
SEP 5, joined near base with reflex narr 2mm long apps in sinuses, v hairy like lvs
lobes narr lance, acute, 8x2mm
PET 5 joined, bell, blue, oblance, whole ~10mm wide
lobes rounded, 3x3mm
sp finely hairy outside
STAM 5, fitting into white apps at base of petals, incl, beautiful gold sparkly pollen in dark brown anthers
anth dorsifix, lat slits
OV 1, sup, 1 chamb, ov, long straight bristly
STYLE 1, short, < stam, barely 2 lobed at tip, stigmas min
Keyed out using JM; seems entirely plausible.

Amsinckia menziesii intermedia [voucher]

With the Pholistoma above.
GEN ann, unbr
ST finely long bristly
LF alt, entire, simple, lin-oblance, ascend, 50x5mm, finely long bristly
INFL d cyme at top, pedicel < 1mm
SEP 5, free, lance, 5x1.5mm, v d long bristly, erect
PET 5, joined mostly, lobes 2.5x1.5, rounded, tube and throat 7x1mm, yellow w red-orange dots at betwee lobes at top of throat
STAM 5, fils 1.5mm, att ~2mm bel throat, incl
ANTH brown, 1mm, dorsifix, lat slits, yell pollen
OV 1, sup, 4 lobes, deeply lobed, lobes ovoid, v min horz ridged/wrinkled, green, glab
STYLE = stam, min head
Again, JM did a great job on this one. Curtis thinks it's too delicate to be this?

Populus fremontii

LF 40-50x50-60+25mm, widely ov, acum, trunc, coarsely scalloped except tip, petiole horz comp near base of lf (allowing it to wave side to side easily), glab, shiny, med-dk green both sides, 1-2-vein yellowish, midvein raised a bit bel, marg yell in v fine line

? [voucher]

GEN peren, subshrub or herb
ST strig
LF alt, lance-ellip, 12x2mm, acute, strig
SEP 5, joined mostly, 3x1.5mm
lobes delt, 1x1mm
strig, midstripe dker than rest
PET 5, joined almost entirely, pleated, violet-blue, white at base, 7x10mm maybe wider if fully deployed, strig and lter outside
STAM 5, att at base of petals, alt petals
fil thread, white, 2mm
anth 2mm, white, basifix, lat slits
incl
OV 1, sup, ellip, green, glab, 4 segs, barely lobed or lined outside
STYLE 2 forks each 2 forked again, stig min, white, twisty, thread, > stam

Rhus lancea [voucher]

GEN tree
LF alt, palm
lflts 3, 100x8mm, narr lance-lin
petiole 25mm, shiny, lter bel, midvein raised and yellow ab, margin yellow, long acute, narr wedge base, glab
INFL d clust in axils, many fls per clust
SEP 5, free, persist, green, min
PET 5, free, persist, min
STAM ?
OV 1, sup, 1 chamb, 1 ovule
STYLE 3, persist as little bristles
FR berry, 1 seed, round but sl lat comp, lt green, 4x5x4mm, hard to separate seed from fleshy covering, glab

Coursetia glandulosa

GEN shrub, unarmed or thorns fine and stipule-like
LF alt, even-pin, shiny strig
lflts 6-8, ellip, apic, subsess
INFL d cyme almost umbel, pedicels 10mm, v d yell gland pubesc
SEP 5, joined, reg, 6x4mm, reddish, v d gland pubesc
lobes 4x1.3mm, delt
persist
PET pea-like, white except for some conspic yell on distal part of wings, wing = keel, 13x13x8mm or so, persist
STAM 9 + 1, incl
STYLE 1, v puber upper 2.5mm, stig min
FR 25x4mm, dehisc pod, twisted 2-3 times, strig and stip gland, deep brownish red, straight, sev seeds