Baptisia lactea
Baptisia tinctoria
western white indigo
horseflyweed, yellow wild indigo
petiolate;
stipules caducous, lanceolate, 2–8 mm;
petiole 5–15 mm;
leaflets 3, blades obovate.
shortly petiolate or subsessile;
stipules deciduous, minute;
leaflets 3, blades obovate-cuneate to spatulate.
8–20-flowered, terminal, stiffly erect, ebracteate.
6+-flowered, terminal, long-exserted, bracteate, bracts caducous.
3–10 mm.
3–5 mm.
18–25 mm;
calyx 7–8 mm, glabrous;
corolla white, 16–23 mm.
14–18 mm;
calyx 4–5 mm, glabrous or glabrate;
corolla yellow, 12–16 mm.
black in age, ascending to spreading-pendent, plump, ellipsoid-cylindric, 23–50 × 10–30 mm, smooth.
exserted-stipitate, erect, ovoid to ellipsoid, 8–15 × 5–9 mm, ± woody.
20–30.
6–8.
= 18.
Baptisia lactea
Baptisia tinctoria
Varieties 2 (2 in the flora).
Baptisia lactea forms hybrids with B. lanceolata, B. nuttalliana, B. sphaerocarpa (B. × sulphurea Engelmann), and B. tinctoria (B. × deamii Larisey).
Peripheral intergradation between var. lactea and var. pendula occurs (hence their treatment as varieties); they are not known to co-occur at present.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Baptisia tinctoria forms hybrids with B. alba (= B. × serenae M. A. Curtis), B. lactea (B. × deamii Larisey), and B. perfoliata (B. × fulva Larisey [= B. × microphylla Nuttall]). Within Baptisia, B. tinctoria and the unifoliolate-leaved species form an isolated clade (M. G. Mendenhall 1994).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Legumes 10–15 mm wide; mature stipes about as long as calyces; c United States. | var. lactea |
1. Legumes 15–30 mm wide; mature stipes much longer than calyces; se United States. | var. pendula |
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