Chesneya

Taxonomy

Chesneya J. Lindley ex S.F.L. Endlicher Gen. 1275. Aug 1840.

Subfamily: Faboideae.
Phylogenetic Number: 3.16.14.
Tribe: Galegeae.
Subtribe: Astragalinae.
Species Studied - Species in Genus: 9 studied; 20 in genus.

Description

Fruit: A legume; unilocular; 2.5–8 cm long; 0.5–1.2 cm wide; 0.2–0.5 cm thick; 2–9 times longer than wide; with deciduous androecial sheath; with deciduous corolla; with persistent calyx; with calyx shorter than fruit; without orifice formed by curving of fruit or fruit segments; straight; not plicate; not twisted; asymmetrical; lanceolate, or linear (to lanceolate), or oblong; with both sutures nearly straight; not inflated, or inflated; compressed; with beak; straight; with solid beak the same color and texture as fruit; tapered at apex; aligned with longitudinal axis of fruit; rounded at base; aligned with longitudinal axis of fruit; with the apex and base uniform in texture; coriaceous; seed chambers externally faintly visible; seed chambers with the raised seed chambers not torulose; margin not constricted; margin without sulcus; margin plain; wing(s) absent; nonstipitate; with all layers dehiscing; splitting along suture(s). Dehiscence of valves along both sutures; apical and down; active, or passive; with valves twisting. Replum invisible. Epicarp dull; monochrome; reddish brown; with surface texture uniform; pubescent and indurate; with hairs erect, or appressed; with 1 type of pubescence; puberulent, or villous; with pubescence gray; with pubescence uniformly distributed; with simple hairs; pliable; with hair bases plain; eglandular; without spines; not smooth; with elevated features; veined; reticulately veined; not tuberculate; not exfoliating; without cracks; without embedded tissue, much thicker than epicarp, running from base to apex. Mesocarp present; thin; surface not veined; 1-layered; without balsamic vesicles; without fibers; without reniform canals; solid; coriaceous. Endocarp present; visible; dull; opaque; monochrome; brown; smooth and scurfy, or cobwebby; without adhering pieces of testa; septate, or nonseptate; with septa thin (tissue paper-like), flexible; with septa eglandular; chartaceous; not exfoliating; remaining fused to mesocarp and epicarp; without wings; entire. Seed(s) 8–12; length parallel with fruit length; touching, or neither overlapping nor touching; in 1 series. Funiculus 0.5–4 mm long; of 1 length only; filiform (or nearly so); straight, or curved (slightly). Aril absent.

Seed: 2.5–6 mm long; 2–4 mm wide; 1–1.2 mm thick; not overgrown; not angular, or angular; asymmetrical; mitaform (and bent on faces), or reniform (and bent on faces), or irregular; compressed; with surface smooth; without visible radicle and cotyledon lobes; without hilar sinus; without umbo on seed faces; without medial ridge on each face. Cuticle not exfoliating; not inflated; not wrinkled. Testa present; without pieces of adhering epicarp; not adhering to endocarp; free from endocarp; dull; not modified by a bloom; colored; monochrome, or mottled and streaked; with frequent mottles; with frequent streaks; brown to reddish brown, or tan; with black overlay; glabrous; smooth, or not smooth; with elevated features, or recessed features; wrinkled, or warty, or shagreen, or reticulate; pitted with small separate pits, or large depressions on each face (2); chartaceous. Pleurogram absent. Pseudopleurogram absent. Fracture lines absent. Rim absent. Wing(s) absent. Raphe visible; from hilum to lens; not bifurcating; darker than testa; blackish brown, or black; flush. Hilum present; fully concealed; concealed by radicle lobe, or wing; with faboid split; with the lips of the faboid split the same color as the rest of the hilum; punctiform; between cotyledon and radicle lobe; flush; not within corona, halo, or rim. Lens barely discernible, or not discernible; with margins curved; more or less circular; not in groove of raphe; adjacent to hilum; 1.5 mm from hilum; flush; dissimilar color from testa; darker than testa; blackish brown; not within corona, halo, or rim. Endosperm present; thick; not pluglike and not resembling tip of radicle; covering entire embryo; adnate to testa. Cotyledons smooth; both outer faces convex; both the same thickness; both more or less of equal length; not folded; margin entire 180 degrees from base of radicle; similar at apex; partially concealing radicle; entire over radicle; without lobes; with the interface division terminating at base of radicle; without margins recessed; reddish brown; inner face flat; glabrous on inner face. Embryonic axis deflexed; oblique to length of seed; without a joint evident between the radicle and the cotyledons. Radicle differentiated from cotyledon; linear; lobe tip hooked; deflexed and parallel to cotyledon length; centered between cotyledons; less than 1/2 length of cotyledons, or 1/2 to nearly length of cotyledons. Plumule rudimentary; glabrous.

Distribution

Central and southwestern Asia to Mongolia.

Old World; Mediterranean to Russia to China to India to Southwest Asia to Mongolia (central to southwestern including Pakistan and India; Mongolia).

Tribal Notes

Tribe Galegeae

Traditionally this tribe has been called Galegeae. Reveal (1997) reported that the name Astragaleae was published before the name Galegeae. Following the International Code of Botanical Nomenclature (Greuter et al., 1994), the oldest name for a taxon must be used, so Reveal suggested that this tribe should be called Astragaleae. In 1999 Reveal (1999) reversed himself, so that this tribe remains the Galegeae. Welsh (1960) reported on the Galegeae of north-central United States. Sanderson and Liston (1995) carried out cladistic analyses of Galegeae genera using molecular data. They concluded that Galegeae is paraphyletic having given rise to tribes Cicereae (20), Hedysareae (18), Trifolieae (21), and Fabeae (19), and therefore requiring a re-evaluation of the circumscription of Galegeae. Heenan (1995, 1998c), utilizing unpublished nuclear ribosomal DNA ITS data, concluded that "Carmichaelia (17.05) is nested within (the) 'Astragalean clade' of Galegeae" and is the sister group of Clianthus. He therefore supported the proposal of Sanderson and Wojciehowski (1996) that Carmichaelieae should not be recognized at tribal level, but rather included in Galegeae.