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Houstonia biloba

Description

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Family Rubiaceae

The Rubiaceae are trees , shrubs , or infrequently herbs comprising about 450 genera and 6,500 species, including some lianous forms. The leaves are simple and usually entire , and are opposite or sometimes whorled ; stipules are present and interpetiolar . The flowers are nearly always bisexual and actinomorphic , often heterostylous, and usually are in cymose inflorescences. The calyx is mostly somewhat reduced and 4-5-lobed or sometimes the lobes are obsolete or rarely one of them greatly expanded and brightly colored . The sympetalous corolla is mostly 4-5-lobed, occasionally with 3 or up to 10 lobes. The androecium consists of as many stamens as corolla lobes and is adnate to the corolla tube or epigynous zone, alternate with the lobes. The gynoecium consists of a single compound pistil of 2 or seldom more carpels, a single style , and a nearly always inferior ovary with the number of locules equaling the number of carpels, each with 1-many axile ovules. An epigynous nectary disk is usually present. The fruit is variable, sometimes forming multiples . -- Gerald Carr.

Taxonomy

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Similar Species

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Members of the genus Houstonia

There are approximately 83 species in this genus:

H. pusilla · H. acerosa (Needleleaf Bluet) · H. acerosa acerosa (Needle-Leaf Bluet) · H. acerosa polypremoides (Needleleaf Bluet) · H. acerosa var. acerosa · H. acerosa var. polypremoides (Needleleaf Bluet) · H. acerosa var. tamaulipana · H. angustifolia var. filifolia · H. asperula · H. asperula var. brandegeana · H. asperuloides var. bradegeana · H. asperuloides var. brandegeana · H. asperuloidis · H. biloba · H. brandegeana · H. caerulea (Azure Bluet) · H. caerulea 'Clone One' (Quaker Ladies) · H. caerulea f. albiflora · H. canadensis (Canadian Summer Bluet) · H. chlorantha · H. coerulea · H. coerulea var. elatior · H. coerulea var. toxonorum · H. correllii (Correll's Bluet) · H. crocea · H. croftiae (Croft's Bluet) · H. fasciculata (Cluster Bluet) · H. filifolia · H. galeottii · H. geniculata · H. gracilis · H. gracillima · H. greenei (Greene's Bluet) · H. humifusa (Mat Bluet) · H. humisfusa · H. kingii · H. lanceolata f. albiflora · H. lanceolata var. calycosa · H. latifolia · H. longifolia (Long-Leaf Summer Bluet) · H. longifolia var. longifolia · H. longifolia var. tenuifolia · H. macvaughii · H. michauxii · H. michauxii 'Fred Mullard' · H. micrantha (Southern Bluet) · H. montana var. montana · H. ouachitana (Ouachita Bluet) · H. palmeri · H. palmeri var. muzquizana · H. palmeri var. palmeri · H. parviflora (Greenman's Bluet) · H. polypremnoides · H. procumbens (Fairy Footprints) · H. prostrata (New Mexico Starviolet) · H. pulvinata var. pulvinata · H. purpurea (Large-Flowered Bluets) · H. purpurea f. pubescens · H. purpurea var. calycosa · H. purpurea var. calycosa Gray · H. purpurea var. montana · H. purpurea var. montana (Small) Terrell (Mountain Bluet) · H. purpurea var. purpurea · H. purpurea var. purpurea L. · H. pusilla (Least Bluets) · H. pusilla f. albiflora · H. pusilla f. rosea · H. pygnaea · H. reticulata · H. rosea (Rose Bluet) · H. rubra (Red Bluet) · H. salenia · H. serpyllifolia (Michaux Bluet) · H. serpyllifolia f. alba · H. sharpii · H. spellenbergii · H. stenophylla · H. stenophylla var. parviflora · H. subviscosa (Nodding Bluet) · H. tenuifolia f. leucantha · H. teretifolia · H. terrellii · H. wrightii (Pygmy Bluet)

More Info

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Notes

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Identifiers

Last Revised: 2008-10-13