All forms and genre of English language poetry are acceptable. Although the length of a poem is not restricted, longer poems are more difficult to fit and so stand a lesser chance of publication. And, although we make some effort to accommodate the author's preferences, the requirements of the journal will take priority, and format may be changed. If you require specific fonts and so on, please indicate this, explain and justify in a covering letter.
A document should not normally contain more than ONE poem, unless part of a sequence of poems.