Manihot pringlei S.Watson

Monograph of Manihot (Euphorbiaceae)
Manihot pringlei Watson
Rogers, D. J. & S. G. Appan, taxon no.2
in Flora Neotropica Monograph No. 13
Annotated June, 1971
MEXICO
Tamaulipas, 13.5 mi. S.W. of Ciudad
Victoria (from jet. of hwy. 85 and
Carrera Torres) on the road to Juamave,
just off road. Alt. 5000 to 6000 ft.
Manihot Pringlei Watson
Plants forming a small colony, very
local. Disturbed habitat, in soil
dumped after road construction. Local
vegetation mixed broad leaf oak forest
with DiQOn edule; Croton sp., solanum
shrubs and scattered palms. More or
less erect, 3-4 m. high, 3-4 m. spread,
di-trichotomous branching. Roots
tuberous, shallow, elongated enlarged,
very similar to M. esculenta, surface
relatively smooth, lenticels arranged
along horizontal lines, epidermis
brown (5 YR 4/5*), subepidermis light
tan somewhat yellowish, flesh whitish
somewhat pulpy and soft, very little
indication of HCN. Mature stem light
gray, with vertically oriented elong-
ated lenticels, young stem greenish
gray-brown. Petiole green, reddish
(7.5 R 4/11*) towards the base, veins
on lower leaf surface red (7.5 R 4/11*}
FI. buds reddish (2.5 R	& fls.
reddish externally (2.5 R 4/10*), greei
ish yellow inside (2.5 GY 9/8*), disc
yellow (5 Y 9/9*), tepal lobes erect.
Fr. nearly mature, ovoid-ellipsoid,
apex with a prominent stigma scar,
winged: wings not prominent; ribs verj
dark maroon (2.5 R 3/7*), greenish in
between, surface smooth, disc promin-
ent at base of fruits.
* Nickerson Color Fan, Am. Hort. Counc.
Coll. No.: 528	21 June 1968
Colls.: David J. Rogers, S. G. Appan,
and R. Rogers
04081031