Baptisia cinerea
Baptisia nuttalliana
grayhairy wild indigo
Nuttall's wild indigo
blackening upon drying, petiolate;
stipules mostly deciduous, lanceolate, 10–30 mm;
petiole 5–14 mm;
leaflets 3, blades oval to broadly oblanceolate.
sessile or subsessile;
stipules caducous, small;
leaflets 3, blades elliptic to obovate.
5–20-flowered, axillary, secund, bracteate, bracts deciduous.
1(–3)-flowered, solitary or clustered, axillary, ebracteate.
4–8 mm.
2–5 mm.
21–29 mm;
calyx 6–8 mm, glabrous or puberulent;
corolla yellow, 20–28 mm.
17–22 mm;
calyx 5–8 mm, pubescent;
corolla yellow, 15–20 mm.
ascending, ovoid, 20–30 × 6–10 mm, papery to ± woody.
ascending, ovoid, 8–14 × 8–12 mm, ± woody.
2–4.
8–12.
= 18.
Baptisia cinerea
Baptisia nuttalliana
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 nuttalliana forms occasional hybrids with B. lactea, B. leucophaea, and B. sphaerocarpa, especially in eastern Texas where these taxa are sympatric.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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