Flora of North America species comparison

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Vicia hassei

Hasse's vetch, slender vetch
Habit Herbs annual.
Stems

sprawling or climbing, somewhat robust, to 10 dm.
Leaves

2–4 cm;

tendrils simple or branched;

stipules much smaller than leaflets, semisagittate, without nectariferous patch;

leaflets 4–8, blades elliptic to lanceolate-linear, 8–40 × 1–9 mm, apex acute to truncate, surfaces glabrous or sparsely pubescent.
Inflorescences

1- or 2-flowered, 1–3 cm, ± shorter than subtending leaf rachis.
Flowers

6–9 mm;

calyx base symmetric, lobes subequal, 1/2 length of tube;

corolla white to faint bluish or lavender, banner pandurate, blade equal to claw, glabrous;

style compressed adaxially, pubescent along style.
Legumes

tawny, oblong, 22–38 × 5–7 mm, oblique-tipped, strongly reticulate-veined, glabrous or finely pubescent;

stipe to 2–3 mm.
Seeds

4–7, purplish black, compressed-subglobose, 2.5–3 mm diam.;

hilum encircling 1/5 circumference of seed.
2n

= 14.

Vicia hassei
Phenology Flowering Mar–Apr.
Habitat Sandy or rocky soils, understory of grass- or brush-covered slopes, streamsides, flood­plains, forest margins.
Elevation 0–1200 m. (0–3900 ft.)
Distribution
from FNA
CA; OR; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Vicia hassei was reduced to a variety of V. exigua (= V. ludoviciana var. ludoviciana) by Jepson in 1901. J. S. Lassetter (1975) made a case for retaining V. hassei as a separate species. Chromosomes of V. hassei are much larger than those of V. ludoviciana. Ovaries of V. hassei are pubescent; those of V. ludoviciana are glabrous. Arrangement of hairs on the stylar apices differs, with V. hassei having a pronounced inequilateral stylar brush, and V. ludoviciana having hairs distributed evenly around the tip of the style.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Vicia
Sibling taxa
V. acutifolia, V. americana, V. benghalensis, V. caroliniana, V. cracca, V. disperma, V. faba, V. floridana, V. grandiflora, V. hirsuta, V. lathyroides, V. leucophaea, V. ludoviciana, V. lutea, V. minutiflora, V. narbonensis, V. nigricans, V. ocalensis, V. pannonica, V. pulchella, V. sativa, V. sepium, V. tetrasperma, V. villosa
Synonyms V. exigua var. hassei
Name authority S. Watson: Proc. Amer. Acad. Arts 25: 129. (1890)
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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