Manihot Manihotoides (Euphorbiaceae) - CNCFlora

60 Flora Neotropica
1962; Webster, Miller & Miller 13080 B (PUL) 29.5 miles NW of Acatlan, 18 Aug 1962. Province
Unknown/Uncertain: Jurgensen 582 (BM) Sierra San Pedro Nolasco, 1843;Pavon 34163 (F); Sesse &
Mocifo 30856 (F). GUATEMALA. Huehuetanango: Melbus & Goodman 3652 (F) below San Antonio
Huista, 29 Sep 1944; Seler & Seler 2814 (NY, US) Uaxackanal, 13 Jul 1896; Steyermark 50614 (F)
Cerro Pix Pix, 15 Aug 1942; Steyermark 51474 (F) between Nenton and Miramar, 29 Aug 1942.
LOCAL NAMES. yuca cimarrona (Steyermark 51474).
The three major phenotypic forms of Manihot rhomboidea subsp rhomboidea, the
rhomboidea form, the mexicana form and the ludibunda form appear as three peaks in
the "SKYLINE" (Fig 5), with several intermediate forms between the peaks. This
indicates close phenotypic similarity between the forms. A study of the geographical
distribution shows that the forms do not have any geographical integrity of their own,
and all the forms occur over the entire range of this subspecies. There are several
collections where two or more forms are represented in the same collection, (c f Rogers
508).
The close phenotypic similarity of subspecies rhomboidea with the other subspecies
microcarpa is evident in Fig 5. However, there are a few morphologic characters which
consistently differentiate these two populations (described in the morphological diagnosis
of these subspecies) indicating that there is only limited interbreeding between these two
populations. Nevertheless, these two populations do not seem to represent 2 closed gene
pools. There are indications of genetic exchange between these two populations along the
line where these two meet, as evident from the frequent occurrence of forms which are
morphologically more or less intermediate between these two subspecies, in the region
where they merge. These two populations are, therefore, assumed to be partially isolated
segments of one single closed gene pool, and as such designated as two subspecies of one
biological species.
10b. Manihot rhomboidea Mueller von Argau subsp microcarpa (Mueller von Argau)
Rogers & Appan, stat nov
Manihot rhomboidea Muell.-Arg., Linnaea 3: 205. 1865 pro parte. Type. Sesse s n (Sesse,
Mocino, Castillo & Maldonado 4224) (syntype, F).
Manihot microcarpa Muell.-Arg., Flora 55: 42. 1872. Type. Karwinsky s n (M, photo at F, G).
Manihot parvicocca Croizat, Jour Arnold Arb. 23: 219. 1942. Type. Matuda 1665 (holotype, A:
isotypes, MICH, MO, NY, US).
Median lobes gladiate, with or without falcate, ascending lobules near the base. Most
plant parts green, without other pigmentation. Fig 19A, B.
TYPE. Karwinsky s n: Mexico: (M, photo of type F, G).
DISTRIBUTION. (Fig 18A). Mexico: Nayarit, Jalisco, Colima, Michoacan, Mexico,
Guerrero, Morelos, Oaxaca and Chiapas; Guatemala; El Salvador; Honduras; and
Nicaragua. Alt 300-2000 m. Ecologically this subspecies is very similar to Manihot
rhomboidea subsp rhomboidea, but subsp rhomboidea is sympatric over the entire range
of section Foetidiae, while subsp microcarpa is allopatric, not overlapping the range of
any Manihot species. The range of subsp microcarpa is the longest among the taxa in this
study, extending from 13 N in Nicaragua to 22 N in Nayarit, Mexico, indicating its
adaptability to flourish within such a wide latitudinal range. MEXICO. Nayarit: Feddema 909
(US) 3 miles NE of Puga, 22 Aug 1959; McVaugh 13386 (MICH) 10 miles SE of Tepic, 6 Oct 1952;
McVaugh 16580 (MICH) near KM 886, ca 10 miles SE of Tepic, 30 Aug 1957. Jalisco: McVaugh
15954 (MICH) ca 11 miles N of bridge of Rio Chihautlan, 1 Aug 1957;McVaugb 18128 (MICH, US)
Puente San Pedro, 5 miles SW of Tecaltitlan, 22 Sep 1958; Palmer 142 = 156 (GH, NY) Rio Blanco,
Jun-Jul 1886; Rose & Hough 4751 (US) near Tequila, Jul 1899; Zingg 10 (F) Mountains near Bolanos,
1935. Colima: McVaugb 15486 (MICH) ca 18 miles E of Colima at km 189, 17 Jul 1957; McVaugh
15531 (MICH-2) 10 miles SSW of Colima on Manzanillo Road, 18 Jul 1957. Michoacan: Hinton
15072 (NA, NY, US) Barroloso, 7 Aug 1939. Mexico: Hinton 4467 (BM, F, GH, US) Ixtapan, 1 Aug
1933. Morelos: Kenoyer s n (ARIZ, MICH) Cuernavaca, 16 Jul 1938; Knechtel 507 (W) Cuernavaca;