Flora of North America species comparison

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Manihot angustiloba

desert-mountain manihot, narrow-leaf cassava, pata de gallo
Habit Herbs or subshrubs, 1–3 m. Roots thickened.
Stems

erect, terete when young;

nodes not swollen;

leaf and stipule scars not elevated.
Leaves

stipules lanceolate, entire;

petiole 3–12 cm;

blade basally attached, 5–7-lobed, lobes with acute secondary lobes proximally, median lobe 5–15 cm, margins neither thickened nor revolute, remotely serrate, apex acute, surfaces glabrous, abaxial smooth.
Inflorescences

axillary, racemes, to 12 cm.
Pedicels

staminate 3–8 mm; pistillate 10–25 mm in fruit, downcurved.
Staminate flowers

calyx campanulate, 10–18 mm, lobes erect or spreading;

stamens 10.
Capsules

1.5 cm, finely tuberculate, not winged.
Seeds

globose, 12 mm.

Manihot angustiloba
Phenology Flowering Jul–Oct.
Habitat Desert scrub, thorn scrub, oak woodlands, oak grasslands.
Elevation 30–2000 m. (100–6600 ft.)
Distribution
from FNA
AZ; Mexico (Baja California Sur, Chihuahua, Sinaloa, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

D. J. Rogers and S. G. Appan (1973) noted the overall similarity and nearly identical geographic ranges of Manihot angustiloba and M. davisiae, yet they maintained these taxa as separate species, presumably because of their (nearly) constant and consistent differences in leaf lobe outline. Manihot angustiloba has generally narrow, nearly linear, primary lobes with a pair of serrate secondary lobes forming the widest portion of the lobe proximal to the middle; M. davisiae has generally broader leaf lobes with one pair of rounded secondary lobes that form the widest portion of the lobe distal to the middle, or two pairs of nearly equal, rounded, secondary lobes proximal and distal to the middle. Some specimens exhibit an intermediate condition: primary lobes that are narrow distally but also bear a pair of rounded secondary lobes proximal to the middle.

In the flora area, Manihot angustiloba is restricted to Cochise, Pima, and Santa Cruz counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 194.
Parent taxa Euphorbiaceae > Manihot
Sibling taxa
M. davisiae, M. esculenta, M. grahamii, M. subspicata, M. walkerae
Synonyms Janipha manihot var. angustiloba
Name authority (Torrey) Müller Arg.: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 15(2): 1073. (1866)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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