No key was found for the requested taxon, but it has only one child: Gardenia jasminoides. Showing where it is keyed below.

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Key to Rubiaceae

Rubiaceae

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1 Trees, shrubs, or woody vine.
  2 Prostrate or climbing woody vine (liana), or sprawling shrubs.
    3 Leaf base cordate, rounded, or truncate; leaves usually cordate, ovate, or deltoid shaped (occasionally hastate or broadly elliptic); corolla pale lilac colored; [non-native, se. US including FL; tribe Paederieae]
    3 Leaf base cuneate to rounded but not cordate; leaves oblanceolate, lanceolate or linear; corolla white or yellow; [native, FL].
      4 Flowers and fruit sessile or subsessile; fruit yellow
      4 Flowers and fruit borne on pedicel or peduncle; fruit white
  2 Shrub or tree, plants upright.
        5 Inflorescence spherical or globular, in a tight round head; [collectively widespread].
          6 Inside of corolla glabrous; [waif, s. FL]
          6 Inside of corolla pubescent; [natives and non-native; widespread, including s. FL]
             7 Fruits dry, dehiscent, composed of nutlet; lobe of the corolla smaller; [subfamily Cinchonoideae; tribe Naucleeae]
             7 Fruits fleshy, indehiscent, composed of drupe-like syncarp; lobe of the corolla larger (inflorescence with 1 petaloid calycophyll in M. citrifolia); [subfamily Rubioideae; tribe Morindeae]
        5 Inflorescence cymose, thyrsoid, or corymbose (the inflorescence more open, not globular); [Coastal Plain, from s. SC southward].
               8 Plants with paired spine.
                 9 Corolla lobe 4; leaves to ca. 1 cm long; fruit ca. 5 mm long
                 9 Corolla lobe 5; leaves ca. 2-5 cm long ; fruit ca. 10 mm long
               8 Plants unarmed, not bearing spine or thorn.
                   10 Flowers orange-red; leaves usually whorled; [subfamily Cinchonoideae; tribe Hamelieae]
                   10 Flowers white, green, or maroon; leaves predominantly opposite.
                     11 Leaves linear, revolute, and strongly congested at branch tips; [FL keys southward]
                     11 Leaves broad, not linear, nor strongly congested (except sometimes in Guettarda); [widespread, including s. FL].
                       12 Flowers solitary, terminal, appearing Rose or Magnolia-like; [horticultural waif; subfamily Ixoroideae; tribe Gardenieae]
                       12 Flowers in cymose or thyrsoid inflorescence, not appearing Magnolia or Rose-like (sometimes singular in Exostema, but the corolla is conspicuously salverform); [natives, s. SC southward through FL]
                          13 Corolla salverform, the tube long and slender, ca. (1.5-) 2-9 cm long, the petal noticeably shorter than the tube (or if of similar length then the lobe linear, as in Exostema); [c. and s. FL only in our area].
                            14 Leaves ovate, elliptic, or lanceolate, not conspicuously rounded in shape (or at least this not predominant); corolla tube 2-5 cm long, the corolla lobe often recurved apically, linear and of similar length to corolla tube; stamen conspicuously exerted; [s. FL]
                            14 Leaves sub-orbicular to oval, conspicuously rounded in shape (the surfaces scabrous in G. scabra); corolla tube (1.5-) 2-9 cm long, the corolla lobe shorter than the corolla tube; [c. and s. FL]
                          13 Corolla not salverform (or if the tube somewhat lengthened not 2-5 cm long), the corolla lobe broadened and not typically recurved apically; stamen exerted or not; [s. SC southward through FL].
                              15 Inflorescence cymose; some calyx lobe expanded into pink or reddish “flags”, the corolla lobe often pink-dotted; leaves deciduous; domatia not present; [of s. SC southward]; [subfamily Ixoroideae; tribe Condamineeae]
                              15 Inflorescence thyrsoid; calyx lobe inconspicuous; leaves evergreen; domatia present or absent in secondary abaxial vein axil; [of ne. FL southward].
                                16 Fruit large, fig-like (5-7 cm long berries), obovoid, green-colored when ripened and somewhat dull; [subfamily Ixoroideae; tribe Gardenieae]
                                16 Fruit smaller (pea-sized or smaller, ca. 4-6 mm in diameter), rounded and berry or drupe-like, white, red, or black colored when ripened, usually at least somewhat lustrous.
                                  17 Leaves with 8-14 pairs of prominently depressed secondary vein on the upper (adaxial) surface, the veins nearly arising perpindicular from the midvein and often curving (arcuate) toward the leaf margin (thus causing the leaf tissue to almost "rise" from between the veins), the blade herbaceous or membranous; fruit red; [subfamily Rubioideae; tribe Psychotrieae]
                                  17 Leaves usually with < 8 secondary vein, these not conspicuously depressed within the leaf blade (sometimes the midvein moderately depressed); the blade leathery; fruit black or white; [subfamily Cinchonoideae; tribe Chiococceae]
                                    18 Inflorescence elongate-thyrsoid, pedicel bent to one side, petal yellowish; ripened fruit white; plants often vine-like or sprawling shrubs
                                    18 Inflorescence cymose or corymbose, usually terminal, petal whitish; ripened fruit black; plants upright shrubs
1 Herbs (or creeping subshrub in Mitchella); [ADD Borreria]
                                       19 Leaves whorled; [subfamily Rubioideae; tribe Rubieae]
                                       19 Leaves opposite.
                                         20 Fruit bright blue or purple, the apex bearing a partially persistent calyx; [waif, c. FL]
                                         20 Fruit variously colored but not bright blue to purple, the calyx not partially persistent or inconspicuously so; [widespread natives and non-natives].
                                           21 Flowers paired, the ovaries connate and developing into a single fleshy red fruit; leaves roundish; creeping subshrub; [subfamily Rubioideae; tribe Mitchelleae]
                                           21 Flowers single or in inflorescence with multiple flowers, the fruits either dry or fleshy and yellowish or black; leaves various; herb; [subfamily Rubioideae; tribe Spermacoceae].
                                             22 Carpel with few to many seeds.
                                               23 Corolla 5-lobed.
                                                 24 Flowers variously colored, often pinkish-purple or whitish-pink; leaf blade often > 5 cm long; plants perennial, erect, not succulent; [waif, c. and s. FL]
                                                 24 Flowers white; leaf blade < 5 cm long; plants annual, creeping or only partially erect, partially succulent; [uncommon exotic, SC s. to FL, w. to TX and AR]
                                               23 Corolla 4-lobed.
                                                    25 Leaf blade 1-5 mm long; plants conspicuously creeping
                                                    25 Leaf blade (3-) 5-50 mm long; plants erect, spreading, or prostrate.
                                                      26 Capsule longer than the calyx tube; flowers blue, pink, or white
                                                      26 Capsule not longer than the calyx tube; flowers white
                                             22 Carpel 1-seeded.
                                                        27 Flowers in dense, terminal, involucrate heads; flowers 4- or-6-lobed; style 3
                                                        27 Flowers in axillary or terminal clusters, or single in axil, not involucrate; flowers 4-lobed; style 2.
                                                          28 Flowers usually solitary in leaf axil; fruit separating into 2 parts.
                                                            29 Sepal 4 and similar in size; style entire; [of dry habitats]
                                                            29 Sepal 2 (or 4, and then markedly dimorphic); style cleft; [of moist to wet habitats]
                                                          28 Flowers in terminal and axillary clusters; fruits not separating into 2 parts.
                                                              30 Carpel opening transversely
                                                              30 Carpel opening longitudinally