10.
Mirabilis tenuiloba
S. Watson, Proc. Amer. Acad. Arts. 17: 375. 1882.
Hesperonia tenuiloba
(S. Watson) Standley
Stems
decumbent to erect, usually forming leafy clumps, 3-10 dm, herbaceous or suffrutescent basally, usually glandular-viscid, more densely so distally.
Leaves
spreading or ascending; petiole 0.1-2.2(-5) cm; blade broadly deltate or ovate, 2-5(-8) × 1.7-7(-12) cm, fleshy to slightly succulent, base rounded to cordate, apex acute (rounded), glabrate to glandular-villous.
Inflorescences
usually thyrselike, often narrow; involucres 7-16 mm, lobes narrowly lance-oblong, base 30-50% of height.
Flowers
1 per involucre; perianth usually white (pale pink), 1.3-1.8 cm.
Fruits
dull reddish brown to almost black, rarely with 10 inconspicuous, paler lines, sometimes with several very shallow grooves, broadly ovoid, 4-6 mm, surfaces smooth or very slightly rugose.
Flowering spring, occasionally other seasons. Sands and rocks on slopes, cliffs, and canyon sides in open arid and semiarid areas; 0-400(-900) m; Ariz., Calif.; Mexico (Baja California, Baja California Sur).
