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FNA | Family List | FNA Vol. 7 | Brassicaceae

86. Hesperidanthus (B. L. Robinson) Rydberg, Bull. Torrey Bot. Club. 34: 433. 1907.

[Genus Hesperis and Greek anthos, flower, alluding to resemblance of flowers]

Ihsan A. Al-Shehbaz

Thelypodium Endlicher subg. Hesperidanthus B. L. Robinson in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 174. 1895; Caulostramina Rollins; Glaucocarpum Rollins

Perennials or subshrubs; (caudex well-developed, woody); not scapose; (glaucous), glabrous. Stems (simple or few to several from base), erect or ascending, usually branched distally. Leaves cauline; not rosulate, petiolate, subsessile, or sessile, blade (somewhat fleshy, becoming leathery when dry, base not auriculate), margins entire, denticulate, or coarsely dentate. Racemes (corymbose, few- to several-flowered, sometimes bracteate proximally), elongated in fruit. Fruiting pedicels divaricate to ascending or suberect, slender. Flowers: sepals ascending to erect, oblong, lateral pair usually not saccate basally (slightly saccate in H. linearifolius, apex of median pair cucullate or not); petals white, lilac, lavender, purple, or yellow (sometimes with darker veins), spatulate, claw differentiated or not from blade; stamens tetradynamous or subequal; filaments not dilated basally; anthers oblong to linear, (apex obtuse or apiculate); nectar glands: lateral annular or lunar, median glands often confluent with lateral. Fruits sessile or stipitate, linear, not torulose, terete or slightly latiseptate; valves each with prominent midvein; replum rounded; septum complete; ovules 8-110 per ovary; style distinct; stigma capitate or conical, entire or 2-lobed (lobes prominent, connivent). Seeds uniseriate, plump, not winged, oblong; seed coat not or slightly mucilaginous when wetted; cotyledons incumbent or obliquely so. x = 11.

Species 5 (5 in the flora): w United States, n Mexico.

SELECTED REFERENCES Al-Shehbaz, I. A. 2005. Hesperidanthus (Brassicaceae) revisited. Harvard Pap. Bot. 10: 47-51. Rollins, R. C. 1938. Glaucocarpum, a new genus in the Cruciferae. MadroƱo 4: 232-235. Rollins, R. C. 1982b. Thelypodiopsis and Schoenocrambe (Cruciferae). Contr. Gray Herb. 212: 71-102.

1 Petals yellow; fruits 1-2 cm; ovules 8-16 per ovary.   5 Hesperidanthus suffrutescens
+ Petals purple, lilac, lavender, or white; fruits (1.8-)2.5-11 cm; ovules 26-110 per ovary   (2)
2 (1) Median sepals cucullate; stigmas conical, lobes connivent; petal veins not darker than blade; ovules (76-)80-110 per ovary; Arizona, Colorado, New Mexico, Texas.   1 Hesperidanthus linearifolius
+ Median sepals not cucullate; stigmas flat, lobes entire or obscure; petal veins darker than blade; ovules 26-62 per ovary; California, Utah   (3)
3 (2) Leaves petiolate, blades ovate to broadly so, 10-35 mm wide, margins coarsely and irregularly dentate; California.   4 Hesperidanthus jaegeri
+ Leaves sessile, subsessile, or petiolate, blades linear, linear-lanceolate, oblong, elliptic, or oblanceolate, (0.8-)1-24 mm wide, margins entire or obscurely denticulate; Utah   (4)
4 (3) Leaves sessile or subsessile, blades linear or linear-lanceolate; sepals 4.2-6.5 mm; anthers oblong, 1-1.5 mm.   2 Hesperidanthus argillaceus
+ Leaves petiolate, blades oblong, elliptic, or oblanceolate; sepals 5-8 mm; anthers linear, 2.5-3 mm.   3 Hesperidanthus barnebyi

Lower Taxa


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