Dalea albiflora
Dalea exserta
whiteflower prairie clover
Mexican prairie clover
(2–)2.5–5(–7) dm, sparsely gland-dotted distally.
ribbed, (1.5–)5–10(–12) dm, glandular-verrucose distally.
spikes, densely flowered, not involucrate, 7–10 mm diam.;
axis not visible, (1–)1.5–6(–7) cm;
bracts early deciduous to persistent, 1.5–3.2 mm.
spikes, relatively densely flowered, not involucrate, 13–16 mm diam.;
axis usually not visible, (1.5–)2–8 cm;
bracts deciduous by anthesis, (3–)4–8 mm.
0.5–8.5 cm.
(1–)2.5–14 cm.
10, (5–)6–8 mm, filaments distinct to 3.5–4.5 mm, anthers 0.4–0.6 mm.
8–10, (7.5–)8–11 mm, filaments distinct to 0.1–1.6 mm, anthers 0.4–0.5 mm.
white;
not conventionally papilionaceous;
banner plane, (4.4–)5–6.4 mm, blade oblong-ovate, not peltate, proximally cordate to cuneate, (2.6–)3–4 × (2–)2.2–3.4 mm; epistemonous petals attached high on stamen tube, just proximal to separation of filaments, blades (2.7–)3.1–4.4 × (0.8–)1.3–1.9(–2.2) mm.
white, sometimes banner purplish in age;
not conventionally papilionaceous;
banner 4.9–7.3 mm, blade lanceolate-oblong to oblong-elliptic, 3–4.8 × 2.2–2.3 mm; epistemonous petals attached near or proximal to middle of stamen tube, blades somewhat unequal, laterals (2–)3.4–5 × 1–1.8 mm, abaxials 3–3.7 × 1.1–1.6 mm.
asymmetric, recessed opposite banner, (2.8–)3.2–5.1 mm, pilosulous;
tube (1.9–)2–3(–3.3) mm, with 3–6 glands between ribs, lobes triangular.
asymmetric, recessed opposite banner, 4.8–7 mm, glabrous;
tube (2.5–)2.7–3.8 mm, with 2–4(–8) large glands between ribs, lobes triangular-aristate.
2.2–2.9 mm, villosulous distally and gland-dotted.
2.2–2.8 mm, pilosulous distally and dotted with small glands.
1.6–2 mm.
1.6–1.8(–2) mm.
herbs, erect, ± silky-villosulous.
leaves 1–4 cm;
leaflets (13–)17–35(–41), blades oblanceolate to linear-elliptic, (1.5–)2–7(–10) mm.
leaves 3–10 cm;
leaflets 19–37, blades oblong-elliptic to oblanceolate, 2–9 mm.
herbs, erect, glabrous proximal to inflorescences.
= 14, 24.
= 14 (Mexico).
Dalea albiflora
Dalea exserta
Dalea albiflora is a complex and variable species that could use further morphological and cytological studies. While herbarium specimens cannot be sorted into varieties in any consistent way, in the field, delicate plants with slender, creeping rootstocks may grow with, and appear quite distinct from, plants with a stout caudex; such plants have been called D. ordiae. There are few chromosome counts available; preliminary study suggests that the former plants are tetraploid and the latter diploid (D. E. Ward et al. 1993).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The existence of Dalea exserta in the flora area rests on specimens collected in 1939 by Goodding in Sycamore Canyon, near Ruby in Santa Cruz County. Because it is an annual that often grows in disturbed ground, it may be found again there or at some other locality in southern Arizona.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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