Flora of Dominica, Part 2 - Smithsonian Institution Libraries

NUMBER 77 CONVOLVUIACEAE 73
The correction from “pentantha” to pentanthos was discussed
by Nicolson (1986326) in connection with Greek
adjectives (-os, -on).
Jacquemontia solanifolia
Jacquemontia solanifolia (Linnaeus) Hallier, 1893:542.-Powell, 1979:235.
Ipomoea solanifolia Linnaeus, 1753: 161.
Ipomoea fdiformh Jaquin, 1760:13, “lpomaea.”
Exogoniwn solanifoliwn (Linnaeus) Britton, 1918:82.
Herbaceous vine with ovate leaves; stems often tomentose
with ste1,late hairs, at least the petioles and peduncle bases
tomentose; inflorescence lax with few to several flowers;
corolla tube long and narrow, limb scarcely spreading, 5-lobed;
stamens and pistil exserted; seeds 3-winged.
Puerto Rico and Lesser Antilles; in Dominica along road:
Petite Soufrihre Bay (Nicolson 1986).
Jacquemontia tamnifolia
Jacquemontia tamnifolia (Linnaeus) Grisebach. 1862:474.-Powell, 1979:236.
Ipomoea tamnifolia Linnaeus, 1753:162.
Thyella tamnifolia (Linnaeus) Rafimesque, 1838, Fl. Tellur., 434.
Hirsute or glabrate vine, hairs yellow to reddish brown;
sometimes flowering before twining; peduncles sturdier and
much longer than subtending petioles; inflorescence very
hirsute, a head-like cyme surrounded by several lanceolate or
ovate foliaceous bracts up to 4 cm long; corolla lavender-blue;
seeds wingless.
Tropical America, Africa, the Mascarenes, in Dominica:
Freshwater Lake (Eggers 612 at GH).
Merremia Dennstedt ex Endlicher, nom. cons.
1. Leaves simple and entire; flowers yellow .........
........................ M. umbellata
1. Leaves palmate; flowers white.
2. Leaves compound, leaflets entire; calyx hispid .....
....................... M. aegyptia
2. Leaves lobed, lobes dentate; calyx glabrous ......
....................... M. dissecta
Merremia aegyptia
Uerremia aegyptia (Linnaeus) Urban, 1910,4:505.-Powell, 1979:239.
Ipomoea aegyptia Linnaeus, 1753:162
Convolvulus pentaphyllus Linnaeus, 1762223.
Ipomoea penkzphylla (Linnaeus) Jacquin, 1788, Coll., 2297.
Twiner with hispid stems, leaves and calyx, hairs fewer and
shorter on leaves; cyme lax, one- to several-flowered, corolla
about twice as long as calyx, white, funnel-shaped.
Tropics; in Dominica along roads: Mero (Nicolson 2047).
Woodford Hill (Nicolson 4240).
Merremia dissecta
Merremia dissecta (Jaquin) Hallier, 1893:552, “disecta” .-Powell, 1979:240.
Convolvulus dissectus Jaquin, 1767,2:4, pl. 28.
Ipmoea dissecta (Jaquin) Persoon, 1797:207 [in note], non Willdenow.
Ipomoea sinuata Ortega, 179834.
Twiner with hispid stems, petioles and peduncle bases;
leaves pedate, 5-lobed, the basal lobes divided into two; all
lobes dentate to lobed, cymes 1-5-flowered, flowers erect,
buds and fruits nodding; corolla white with dark center,
funnel-shaped; capsule enclosed by enlarged sepals.
Neotropics but widely naturalized; in Dominica: Castle
Bruce trail (Hodge 3323, Mero (Ernst 1939, below Syndicate
(Whitefoord 4441).
It has, on occasion, been confused with other tropical
American species: Merrem‘a quinquefolia (Linnaeus) Hallier
and Merremia cissoides (Lamarck) Hallier, both smaller plants
with compound leaves of five k dentate leaflets. M. quinquefolia
has dainty, glabrous leaves and flowers, M. cissoides is
coarse, hairy and viscid.
Merremia umbellata
Uerremia umbellata (Linnaeus) Hallier, 1893:552.-Ooststroorn in
Steenis,l953, Fl. Males., I, 4:449.-Powell, 1979:243.
Convolvulus wnbellatus Linnaeus, 1753:155.
Ipomoea wnbellata (Linnaeus) Meyer, 1818:99, non Linnaeus.
Ipomoea pdyanthes Roemer & Schultes. 1819,4:234.
Glabrous or pubescent plant with cordate to k sagittate
leaves; inflorescence umbellate, flowers many to few, yellow,
corolla funnel-shaped, -3.75 cm long: capsule exceeding the
persistent calyx; seeds tomentose.
Neotropics, West Africa, and introduced in the Far East; in
Dominica along west coast: Pointe Ronde (Hodge 2688),
Roseau River valley (Fairchild 2780), sine loc. (Eggers 1450).
This is the typical subspecies, differing from the Old World
subspecies, which has long hairs on the seeds and, generally,
white flowers.
Operculina Silva Manso
Operculina hamiltonii
Operculina hamiltonii (G. Don) Austin & Staples, 1983:487.
Convolvulus alatus Hamilton, 182524, non Sprengel, 1819.
lpomoea hamiltonii G. Don, 1838,4268, “hamiltoni.”
Ipmoea pterodes Choisy in A.P. Candolle, 1845,9361.
Ipomoea altissima Martius ex Choisy in A.P. Candolle, 1845,9:359.
Operculina altissima (Choisy) Meisner in Martius, 1869,7:213, pl. 75.
Operculina pterodes (Choisy) Meisner in Martius, 1869,7:213.
Operculina alata Urban, 1902, 3:343.-Powell. 1979:244.
Petioles, peduncles and sometimes stems winged, glabrous
or pubescent; flowers solitary, peduncle thicker and much
longer than subtending petiole, bearing, at its apex, two bracts
that fall after anthesis and a 5-angled, tapering pedicel that
thickens as the fruit ripens; corolla yellow, -4.5-5 cm long;