Merremia quinquefolia (L.) Hallier f. (Cultivated)
Merremia tuberosa (L.) Rendle (Cultivated)
Indian species of Ipomoea : 9 posts by 7 authors.
Taxonomy of Indian species of Convolvulaceae is most incomplete mainly because The Plant List, supposed to include all published names of plants on this earth has huge number of names missing, as evidenced by my numerous communications to them. Same is true for the genus Ipomoea. In an attempt to construct an easy to use key I have first tried to compile a list of species described/reported from Indian subcontinent. As usual I have attempted to include all names under Ipomoea described in Flora of British India and some transferred now to other genera. This would be for easy reference to the original Flora, till an Indian revision of the family is published (or has been published?):
I am sure the list will have many omissions and errors. You are requested to kindly help improve it before it is finalized.
48. Merremia aegyptiaca (L.) Urb. (syn: Ipomoea pentaphylla (L.) Jacq.)
49. Merremia dissecta (Jacq.) Hall.f. (syn: Ipomoea sinuata Ortega)
50. Merremia emarginata (Burm.f.) Hallier.f. (Ipomoea reniformis Choisy)
51. Merremia gemella (Burm.f.) Hallier.f. (Ipomoea polyantha Miq.) (Ref. JSTOR)
52. Merremia hederacea (Burm.f.) Hallier.f. (Ipomoea chryseoides Ker. Gawl.)
53. Merremia hirta (L.) Merr. (Ipomoea linifolia Blume)
54. Merremia kentrocaulos Rendle (syn: Ipomoea kentrocaulos C B Clarke (Ref. Flora Zambesiaca, JSTOR & Medicinal Plants (2013))
55. Merremia peltata (L.) Merr. (syn: Ipomoea petaloidea Chois.)
56. Merremia quinata (R. Br.) Ooststr. (syn: Ipomoea quinata R. Br.)
56A Merremia quinquefolia (L.) Hall.f.
57. Merremia sibirica (L.) Hallier.f. (Ipomoea sibirica (L.) Pers.) (No online ref. found for its distribution in India)
58. Merremia tridentata (Ipomoea angustifolia; Ipomoea tridentate) = Xenostegia tridentata
58A Merremia tuberosa (L.) Rendle
59. Merremia umbellata (L.) Hall.f. (syn: Ipomoea cymosa (Descr.) Roem.& Shult.
59A Merremia umbellata (L.) Hall.f. subsp. orientalis Hall.f. Ooststr.
60. Merremia vitifolia (Burm.f.) Hall.f. (syn: Ipomoea vitifolia (Burm.f.) Blume)
Recent taxonomy of Convolvulaceae largely revolves around pollen grains and dehiscence if fruits, in addition to usual features of corolla shape, styles and stigma. This is how the closely related genera once placed under Ipomoea are segregated:
Merremia: Pollen smooth, porate; capsule opening irregularly or by 4-valves.
Operculina: Pollen smooth, porate; capsule circumscissile.
Ipomoea: Pollen spinose, colpate; fruit dry capsule usually opening by 4 valves; corolla usually glabrous outside; calyx slightly enlarged in fruit.
Stictocardia: Pollen spinose, colpate; fruit dry capsule splitting irregularly; calyx greatly enlarged enclosing the fruit.
Rivea: Pollen spinose, colpate; fruit indehiscent; corolla pubescent outside; corolla salverform; stamens attached near middle of the tube; fruits dry.
Argyreia: Pollen spinose, colpate; fruit indehiscent; corolla pubescent outside; corolla funnel-shaped; stamens attached below middle of the tube; fruits usually fleshy or leathery.
Perhaps more as we finalize our list.
This is really interesting and highly informative and can be a baseline for further studies on the genus.
I have added a few more species in the above list as above with A & B along with some references against species to show them being found in India.
Species with description & pictures in Flowers of India as on 5.5.14:
Merremia emarginata (Syn: Evolvulus emarginatus N. L. Burman, Fl. Indica 77. 1768; Convolvulus reniformis Roxburgh; Ipomoea reniformis (Roxburgh) Choisy.)
FOLIAR ANATOMY OF INDIAN MERREMIA DENNST. (CONVOLVULACEAE) AND ITS SYSTEMATIC VALUE by MahuaPal and G. G. Maiti- International Seminar on “Multidisciplinary Approaches in Angiosperm Systematics”-
ABSTRACT : The genus Merremia Dennst (Convolvulaceae) is represented by 70 species distributed in the tropics of both hemispheres, out of which in India it is reported by 15 species. The foliar anatomical study is done for 6 species only and the anatomical features are used towards the aid for identity of these studied members. The foliar anatomy deals with nodal features and petiolar anatomical structures, under transverse section, and the foliar venation including areolation, marginal venation and free vein endings and other inclusions. All these characters are used to analyse the differences among the studied members. Moreover, the midvein anatomy is also considered as an additional tool to support anatomical differences of these studied members.
Major venation pattern specially the nature of secondaries, the free vein endings, along with their associated cells, vascular sheath cells of the vein reticulations and also the petiolar anatomy including the nature, behaviour and arrangement of vascular bundles towards distal part of petioles are the important features of anatomical differentiation for the studied members. The genus Merremia by their floral biology has less differences, or rather difficult to differentiate the species. Thus foliar anatomical
study is an additional tool towards the aids of identification of the species.
An Excursion Flora of Central Tamilnadu, India By K. M. Matthew (1995)- Details with keys–
Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah (2004)- Details with keys–
World Spice Plants: Economic Usage, Botany, Taxonomy By Johannes Seidemann (2005)- Details-
Plant Wealth of the Lower Ganga Delta: An Eco-taxonomical Approach, Volume 2 By Kumudranjan Naskar (1995)- Details with keys–
Merremia gangetica (L.) CUFO. (with Evolvulus emarginatus Burm. f. as a synonyms) = Merremia emarginata
Flora of Guntur District, Andhra Pradesh, India (2000)- Details with keys–
Merremia gangetica (L.) CUFO. (with Merremia emarginata (Burm. f.) Hallier f. & Evolvulus emarginatus Burm. f. as synonyms among others) = Merremia emarginata
Indian Medicinal Plants: A Compendium of 500 Species, Volume 4 (1995)- Great details-
Medicinal Plants in Andhra Pradesh, India By T. Pullaiah (2002)- Details-
Biodiversity in India, Volume 4 edited by T. Pullaiah (2006)- Details-
Flora of Ranga Reddi District Andhra Pradesh, India By T. Pullaiah, M. Silar Mohammed (2000)- Details with keys–
Merremia emarginata (with Merremia gangetica (L.) CUFO. & Evolvulus emarginatus Burm. f. as synonyms among others)
Merremia tridentata (L.)H. HALL. = Xenostegia tridentata
Floristic Diversity of Assam: Study of Pabitora Wildlife Sanctuary By Bora, Yogendra Kumar (2003)- Details with keys–
Forest Plants of Eastern India By Amal Bhusan Chaudhuri (1993)-
Merremia gangetica (L.) CUFO. (with Merremia emarginata (Burm. f.) Hallier f. as a synonym among others) = Merremia emarginata
Merremia tridentata (L.)H. HALL. = Xenostegia tridentata
Merremia : 1 post by 1 author.
I have updated eFI (efloraofindia) page on Merremia
Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible. It’s quite possible that there may be some discrepancy in the accepted names & synonyms taken from other links.
Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.
If someone can provide complete list of Indian species with source references it will be wonderful.
Any comments/ corrections are welcome.
Thanks, … for starting some initial work here.
Merremia (Convolvulaceae) page with images of species in efloraofindia : 1 post by 1 author.
If you find any incorrect identification, pl. let us know. If anybody can send images of other species of this genera (for incorporation in the website), if any, it will be really nice.