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FNA | Family List | FNA Vol. 21 | Asteraceae

357. Monolopia de Candolle in A. P. de Candolle and A. L. L. P. de Candolle, Prodr. 6: 74. 1838.

[Greek monos, single, and lopos, husk, alluding to phyllaries]

Dale E. Johnson

Annuals, to 60 cm. Stems erect, branched. Leaves cauline; mostly alternate, proximal sometimes opposite; petiolate or sessile; blades narrowly oblong, oblanceolate, or lance-linear, margins sinuate-dentate or entire, faces loosely to densely woolly. Heads usually radiate (sometimes obscurely disciform in M. congdonii, usually borne singly (in corymbiform arrays in M. congdonii). Involucres hemispheric, 5–13 mm diam. Phyllaries persistent, 4–11 in 1 series (usually spreading, reflexed in fruit in M. congdonii, distinct or connate with distinct tips, elliptic to oblanceolate, herbaceous to membranous or indurate, bases flat or cupped, apices acute to acuminate, abaxial faces woolly, usually with black hairs toward tips). Receptacles convex to conic, smooth or pitted, glabrous, epaleate. Ray florets 4(–7, inconspicuous, corollas ± lacking laminae) or (7–)8(–11), pistillate, fertile; corollas usually yellow, sometimes cream in M. major (each lamina opposed by an adaxial lobule or tooth). Disc florets 20–100, bisexual, fertile; corollas yellow (glandular or with nonglandular hairs); tubes cylindric to cylindro-funnelform, about equaling gradually or abruptly dilated, narrowly to broadly funnelform throats, lobes (4–)5, ± deltate (anther appendages usually widest at bases, glandular; style-branch appendages deltate). Cypselae obcompressed or ± prismatic, 3-angled (ray or peripheral) or 2- or 4-angled (disc); pappi usually 0 (persistent, of 2–4+ spatulate, erose to laciniate scales in M. congdonii). x = 13.

Species 5 (5 in the flora): California.

1 Ray lamina apices entire or obscurely to slightly lobed (mid lobes shorter than outers); disc cypselae ± prismatic (not obcompressed)   (2)
+ Ray lamina apices usually ± equally 3-lobed (laminae sometimes inconspicuous); disc cypselae obcompressed   (3)
2 (1) Cypselae ca. 2 mm, glabrous or sparsely hairy (branches spreading, usually distal)   4 Monolopia gracilens
+ Cypselae 2.5–3 mm, uniformly gray-strigose (branches erect)   5 Monolopia stricta
3 (1) Ray laminae ca. 0.5 mm (inconspicuous); disc cypselae 2-angled (pappi of 2–7 scales)   1 Monolopia congdonii
+ Ray laminae 8–20 mm; disc cypselae 4-angled (pappi 0)   (4)
4 (3) Phyllaries distinct or connate (± 1/2 their lengths); cypselae uniformly gray-strigose   2 Monolopia lanceolata
+ Phyllaries connate (± 3/4 their lengths, forming cups with distinct triangular lobes); cypselae glabrous or apically hairy   3 Monolopia major

Lower Taxa


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