Flora of North America species comparison

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Sphinctospermum constrictum

hourglass peaseed
Habit Herbs to 8 dm.
Leaves

(1–)2–8(–9) cm;

stipules subulate, 1–2 × 0.5 mm;

blade linear-lanceolate.
Inflorescence

bracts linear-lanceolate, 1–2 × 0.5 mm.
Pedicels

1–2 mm.
Flowers

calyx tube 1.5–2.5 mm, glabrate, lobes 1.5–2.5 mm, proximalmost longer than lateral ones, adaxial 2 slightly more connate than lateral ones;

corolla 5–6 mm, glabrous;

filaments subequal;

anthers relatively small, dehiscing longitudinally;

pistil glabrous.
Legumes

light brown, terete, 20–30 × 2–3 mm, base blunt, apex acute, often terminating in persistent style base.
2n

= 16.

Sphinctospermum constrictum
Phenology Flowering Aug–Nov.
Habitat Disturbed areas.
Elevation 50–1700 m. (200–5600 ft.)
Distribution
from FNA
AZ; w Mexico; s Mexico
[BONAP county map]
Discussion

In the flora area, Sphinctospermum constrictum is known from Cochise, Pima, Pinal, and Santa Cruz counties.

The inflorescence of a solitary flower of Sphinctospermum constrictum includes a very short rachis and floral bract subtending the pedicel. Sometimes, a short axillary shoot bearing a flower is borne from this same axil. This results in two flowers from a leaf axil along the main stem. The unifoliolate leaves and solitary flowers are superficially similar to those of 131. Genistidium, and molecular phylogenetic analysis suggests that these two are sister genera (R. Duno de Stefano et al. 2010).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Sphinctospermum
Synonyms Tephrosia constricta
Name authority (S. Watson) Rose: Contr. U.S. Natl. Herb. 10: 107. (1906)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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