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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
Perennial herb to shrub. Leaf: simple, opposite or alternate, sessile or short-petioled, entire to lobed, prominently 1-veined below. Inflorescence: axillary cluster or terminal compound cyme. Flower: bisexual; calyx persistent, lobes (4)5–10(12), ± linear; corolla ± rotate or funnel-shaped, lobes (4)5(8); style slender, stigma head-like, ± 2-lobed. Fruit: papery capsule, deeply 2-lobed to near base. Seed: 2–4.
± 23 species: America, southern Africa. (Greek: gift of force, for sustenance provided to horses of Humboldt and Bonpland in Mexico) [Chumley 2007 Ph.D. Dissertation, Univ Texas, Austin]
Unabridged references: [Turner 1991 Phytologia 712:340–356; Steyermark 1932 Ann Missouri Bot Gard 19:87–176]
1. Shrub, densely mounded; branches many, spreading to ascending, twigs short, stout, becoming thorny; corolla white, tinged red or purple; fruit ± indehiscent ..... M. spinescens
2. Calyx tube in flower generally > 1.5 mm; corolla tube > 7 mm ..... var. mohavensis
2' Calyx tube in flower generally < 1.5 mm; corolla tube < 5 mm ..... var. spinescens
1' Perennial herb to subshrub, broom-like; branches 0–few, ascending to erect, slender; corolla yellow; fruit circumscissile ..... M. scabra
3. Plants generally > 30 cm, ± glabrous; leaves proximal to inflorescence > 5 × width, generally linear or lance-linear; internodes proximal to inflorescence generally > 1.5 × subtending leaves; calyx lobes 5–7(10) ..... var. glabrescens
3' Plants generally < 28 cm, ± scabrous, often densely so; leaves proximal to inflorescence < 4 × width, generally narrowly lanceolate or oblanceolate; internodes proximal to inflorescence generally < 1.5 × subtending leaves; calyx lobes (8)9–10(12) ..... var. scabra
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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