Baptisia cinerea
Baptisia tinctoria
grayhairy wild indigo
horseflyweed, yellow wild indigo
blackening upon drying, petiolate;
stipules mostly deciduous, lanceolate, 10–30 mm;
petiole 5–14 mm;
leaflets 3, blades oval to broadly oblanceolate.
shortly petiolate or subsessile;
stipules deciduous, minute;
leaflets 3, blades obovate-cuneate to spatulate.
5–20-flowered, axillary, secund, bracteate, bracts deciduous.
6+-flowered, terminal, long-exserted, bracteate, bracts caducous.
4–8 mm.
3–5 mm.
21–29 mm;
calyx 6–8 mm, glabrous or puberulent;
corolla yellow, 20–28 mm.
14–18 mm;
calyx 4–5 mm, glabrous or glabrate;
corolla yellow, 12–16 mm.
ascending, ovoid, 20–30 × 6–10 mm, papery to ± woody.
exserted-stipitate, erect, ovoid to ellipsoid, 8–15 × 5–9 mm, ± woody.
2–4.
6–8.
= 18.
Baptisia cinerea
Baptisia tinctoria
Baptisia cinerea closely resembles B. bracteata; the floral bracts in B. cinerea are deciduous (versus persistent in B. bracteata), pedicels are shorter (4–8 versus 10–18 mm), legumes are smaller (2–3 versus 3–4 cm) with appressed (versus spreading) hairs, and leaflets are larger and readily blacken upon drying.
Baptisia cinerea and B. bracteata are essentially allopatric. Hybrids between B. cinerea and other species of Baptisia have not been reported; occasional hybrids between B. cinerea and others (for example, B. lactea) would not be surprising.
(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.)
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