Hymenolobus Nutt. ex Torrey & A. Gray Hymenolobus procumbens, (L.) Nutt. ex Torrey & A. Gray

70. Hymenolobus Nutt. ex Torrey & A. Gray 1

Like Hornungia but hairs unbranched and seeds 3-10 in each loculus.

Literature: R. Pampanini, Nuovo Gior. Bot. Ital. 16: 36 (1909). Stems up to 30 cm; inflorescence many-flowered 1. procumbens Stems not more than 5 cm; inflorescence few-flowered 2. pauciflorus

1. H. procumbens (L.) Nutt. ex Torrey & A. Gray , Fl. N. Amer. 1: 117 (1838)

( Hornungia procumbens (L.) Hayek ; Hutchinsia procumbens (L.) Desv. ).

Annual or biennial with sparse unbranched hairs; stems 3-30 cm, procumbent or erect. Lower leaves deeply lyrate-pinnatifid to entire; upper leaves entire. Inflorescence manyflowered. Petals 1-3 mm, spathulate, equalling or slightly exceeding the sepals. Silicula 2-5 mm, elliptical to obovate; valves translucent, with reticulate veins. 2n— 12,24. Frequently maritime. Mainly S. Europe. BI Co G a Ge G r He It Ju Lu Rm Rs (W, K, E) Sa Si.

Extremely variable. A distinctive variant with leaves all ovateelliptical, entire, petals c. 1-5 mm, and silicula 3 mm occurs in Corse, Sardegna and Malta ( var. revelieri (Pamp.)) . Other variants, about which there is wide disagreement in their characters, make the distinction between 1 and 2 difficult.

2. H. pauciflorus (Koch) Schinz & Thell. , Viert. Naturf. Ges. Zürich 66: 285 (1921).

Like 1 but stems not more than 5 cm, erect; leaves 3-lobed or entire, spathulate; inflorescence fewflowered; silicula orbicular to elliptical. • Cevennes; Alps; Calabria; isolated localities in E. Spain. Au G a He Hs It.