Question: In between Epidendrum and Convolvulus,which one has more than 1,500 species?

Context paragraphs:
Epidendrum sect. Sarcophylla: The section Epidendrum" sect.  "Sarcophylla is a subsection of subgenus "E".  subg.  "Epidendrum" of the genus "Epidendrum" of the Orchidaceae.  In 1861, Reichenbach recognized one species in this section:

Epidendrum secundum: Epidendrum secundum, one of the crucifix orchids, is a poorly understood reed stemmed species, which Dressler (1989) describes as "the "Epidendrum secundum" complex."  According to Dressler, there are dozens of varieties, some of which appear to deserve species rank.  Arditti and Ghani note that "E. secundum "has the distinction of bearing the longest seeds known in the Orchidaceae, 6.0 mm long.  By comparison, the seeds of "E. ibaguense" (another crucifix orchid) are only 2.9 mm long.

Environment of Ecuador: The Environment of Ecuador contains almost 20,000 species of plants, 1,500 species of birds, 341 species of mammals and more than 840 species of reptiles and amphibians.  It includes like the Galápagos Islands, and magnificent parks such as the Yasuni National Park.

Yeast: Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom.  The first yeast originated hundreds of millions of years ago, and 1,500 species are currently identified.  They are estimated to constitute 1% of all described fungal species.  Yeasts are unicellular organisms which evolved from multicellular ancestors, with some species having the ability to develop multicellular characteristics by forming strings of connected budding cells known as pseudohyphae or false hyphae.  Yeast sizes vary greatly, depending on species and environment, typically measuring 3–4 µm in diameter, although some yeasts can grow to 40 µm in size.  Most yeasts reproduce asexually by mitosis, and many do so by the asymmetric division process known as budding.

Paniceae: Paniceae is a large tribe of the Panicoideae subfamily in the grasses (Poaceae), the only in the monotypic supertribe Panicodae.  It includes roughly 1,500 species in 84 genera, primarily found in tropical and subtropical regions of the world.  Paniceae includes species using either of the C and C photosynthetic pathways, as well as presumably intermediate species.  Most of the millets are members of tribe Paniceae.

Homosexual behavior in animals: Homosexual behavior in animals is sexual behavior among non-human species that is interpreted as homosexual or bisexual.  This may include sexual activity, courtship, affection, pair bonding, and parenting among same-sex animal pairs.  Research indicates that various forms of this are found throughout the animal kingdom.  As of 1999, about 500 species, ranging from primates to gut worms, have been documented engaging in same-sex behaviors.  According to the organizers of the 2006 Against Nature?  exhibit, it has been observed in 1,500 species.

Drosophila: Drosophila ( ) is a genus of flies, belonging to the family Drosophilidae, whose members are often called "small fruit flies" or (less frequently) pomace flies, vinegar flies, or wine flies, a reference to the characteristic of many species to linger around overripe or rotting fruit.  They should not be confused with the Tephritidae, a related family, which are also called fruit flies (sometimes referred to as "true fruit flies"); tephritids feed primarily on unripe or ripe fruit, with many species being regarded as destructive agricultural pests, especially the Mediterranean fruit fly.  One species of "Drosophila" in particular, "D. melanogaster", has been heavily used in research in genetics and is a common model organism in developmental biology.  The terms "fruit fly" and ""Drosophila"" are often used synonymously with "D. melanogaster" in modern biological literature.  The entire genus, however, contains more than 1,500 species and is very diverse in appearance, behavior, and breeding habitat.

Cannibalism (zoology): In zoology, cannibalism is the act of one individual of a species consuming all or part of another individual of the same species as food.  To consume the same species or show cannibalism is a common ecological interaction in the animal kingdom and has been recorded for more than 1,500 species.

Convolvulus: Convolvulus is a genus of about 200 to 250 species of flowering plants in the bindweed family Convolvulaceae, with a cosmopolitan distribution.  Common names include bindweed and morning glory; both names shared with other closely related genera.

Epidendrum: Epidendrum , abbreviated Epi in the horticultural trade, is a large neotropical genus of the orchid family.  With more than 1,500 species, some authors describe it as a mega-genus.  The genus name (from Greek "ɛpɨ, epi" and "δένδρον, dendron", "upon trees") refers to its epiphytic growth habit.

Supporting paragraphs: Epidendrum Convolvulus
Answer: Epidendrum