Flora of the Southeastern United States

1 Trees, shrubs, or woody vines.

  2 Prostrate or climbing woody vines (lianas), or sprawling shrubs.

    3 Leaf bases 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 bases 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 pedicels or peduncles; 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 nutlets; lobes of the corolla smaller; [subfamily Cinchonoideae; tribe Naucleeae]

             7 Fruits fleshy, indehiscent, composed of drupe-like syncarps; lobes 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 spines.

                 9 Corolla lobes 4; leaves to ca. 1 cm long; fruit ca. 5 mm long

                 9 Corolla lobes 5; leaves ca. 2-5 cm long ; fruit ca. 10 mm long

               8 Plants unarmed, not bearing spines or thorns.

                   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 inflorescences, 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 petals noticeably shorter than the tube (or if of similar length then the lobes 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 lobes often recurved apically, linear and of similar length to corolla tube; stamens 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 lobes 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 lobes broadened and not typically recurved apically; stamens exerted or not; [s. SC southward through FL].

                              15 Inflorescence cymose; some calyx lobes expanded into pink or reddish “flags”, the corolla lobes often pink-dotted; leaves deciduous; domatia not present; [of s. SC southward]; [subfamily Ixoroideae; tribe Condamineeae]

                              15 Inflorescences thyrsoid; calyx lobes inconspicuous; leaves evergreen; domatia present or absent in secondary abaxial vein axils; [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 veins on the upper (adaxial) surface, the veins nearly arising perpindicular from the midvein and often curving (arcuate) toward the leaf margins (thus causing the leaf tissue to almost "rise" from between the veins), the blades herbaceous or membranous; fruit red; [subfamily Rubioideae; tribe Psychotrieae]

                                  17 Leaves usually with < 8 secondary veins, these not conspicuously depressed within the leaf blade (sometimes the midvein moderately depressed); the blades leathery; fruit black or white; [subfamily Cinchonoideae; tribe Chiococceae]

                                    18 Inflorescence elongate-thyrsoid, pedicels bent to one side, petals yellowish; ripened fruit white; plants often vine-like or sprawling shrubs

                                    18 Inflorescence cymose or corymbose, usually terminal, petals whitish; ripened fruit black; plants upright shrubs

1 Herbs (or creeping subshrubs 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 inflorescences with multiple flowers, the fruits either dry or fleshy and yellowish or black; leaves various; herb; [subfamily Rubioideae; tribe Spermacoceae].

                                             22 Carpels with few to many seeds.

                                               23 Corolla 5-lobed.

                                                 24 Flowers variously colored, often pinkish-purple or whitish-pink; leaf blades often > 5 cm long; plants perennial, erect, not succulent; [waif, c. and s. FL]

                                                 24 Flowers white; leaf blades < 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 blades 1-5 mm long; plants conspicuously creeping

                                                    25 Leaf blades (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 Carpels 1-seeded.

                                                        27 Flowers in dense, terminal, involucrate heads; flowers 4- or-6-lobed; styles 3

                                                        27 Flowers in axillary or terminal clusters, or single in axils, not involucrate; flowers 4-lobed; styles 2.

                                                          28 Flowers usually solitary in leaf axils; fruit separating into 2 parts.

                                                            29 Sepals 4 and similar in size; style entire; [of dry habitats]

                                                            29 Sepals 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 Carpels opening transversely

                                                              30 Carpels opening longitudinally

1 Leaves tiny, bract-like, triangular, 6-14 (-17) per node

1 Leaves either needle-like, scale-like, or flattened and large, (2-) 3-4 (-6) per node.

  2 Leaves needle-like or scale-like, terete, angled, or flat in ×-section, < 2 cm long; leaves (2-) 3-4 (-6) per node

  2 Leaves flat, > 3 cm long; leaves (2-) 3 per node; [Eudicots].

    3 Plant a subshrub, < 3 dm tall, with < 10 leaves per stem.

      4 Leaves entire, broadly elliptic; flowers numerous, in a hemispherical head, subtended by 4 large white bracts

      4 Leaves serrate, narrowly ovate or narrowly obovate; flowers (1-) 2-8 in a long-peduncled umbel or corymb, not subtended by bracts

    3 Plant a shrub or tree, > 3 dm tall, with many > 10 leaves per stem.

        5 Leaves toothed, and most leaves also lobed

        5 Leaves entire, not lobed.

          6 Leaves cordate at base, about as long as wide; medium to large tree.

             7 Flowers white to yellow; capsules linear, >10× as long as wide; leaf undersurface with curly simple hairs; nectar glands present in the main vein axils on the undersurface of the leaf (visible from the underside or the upperside in fresh leaves and herbarium specimens as a triangle 1-4 mm on a side)

             7 Flowers lavender; capsules ellipsoid, < 2× as long as wide; leaf undersurface with branched (dendritic or stellate) hairs; nectar glands absent

          6 Leaves cuneate to rounded at base; leaves > 1.5× as long as wide; shrub to small tree.

               8 Leaves rounded or retuse at the tip (at least some obviously rounded in Pittosporum).

                 9 Fruit a large, globose berry (2-8 cm in diameter), pale brown in color when mature, the surface roughened in texture; petioles with a decurrent, adaxial wing forming a groove; sepals rusty tomentose

                 9 Fruit a capsule, dehiscing alonge 1 or 5 sutures; petioles lacking a decurrent, adaxial wing forming a groove; sepals variously glabrous to pubescent, but not rusty tomentose.

                   10 Ovaries 5-10-carpellate; capsules dehiscing along 5 sutures.

                   10 Ovaries 2-carpellate; capsules dehiscing along one major adaxial suture, appearing berry-like before dehiscence, the seeds often surrounded by a glutinous material

               8 Leaves acute to acuminate at the tip.

                     11 Leaves lanceolate or oblong-elliptic to narrowly ovate (> 2.5× as long as wide), the secondary venation not prominent nor arching-parallel (except Decodon); inflorescences axillary or terminal; flowers pink or white.

                       12 Inflorescences axillary; flowers pink; leaves thin and herbaceous, with prominent secondary veins arching parallel with the margin, also with branching hairs on the abaxial leaf midvein; plants with arching stems, these often tip-rooting; [native plants of wetlands]

                       12 Inflorescences terminal or axillary; flowers pink or white; leaves thick and leathery, lacking prominent secondary veins; plants not tip-rooting nor with branching hairs on the midvein; [exotics of uplands or wetlands, persistent or weakly naturalized]

                          13 Fruit berry-like with 2-locular ovaries; flowers white-colored, smaller; inflorescence axillary or pseudo-terminal.

                          13 Fruit follicles; flowers variously colored (including white), showy and salverform; inflorescence terminal.

                            14 Plants trees, 2-60 m tall, with a single or multiple stem(s); latex milky; flowers white or cream colored, the anthers not connivent and not adhering to stigmas; [uncommon non-natives, s. FL]

                            14 Plants shrubs, 10-40 dm tall, much branched from the base; latex clear; flowers white, pink, or red, the anthers connivent and adhering to the stigmas; [commonly cultivated in our area (and sometimes persistent), particularly near the coast; NC s. to FL, w. to TX]

                     11 Leaves ovate (< 2× as long as wide), the secondary venation prominent and arching-parallel; inflorescences terminal; flowers white, greenish-yellow, red, or orange.

                              15 Flowers in a spherical or hemispherical head; corollas white or greenish-yellow; fruit a globose cluster of nutlets (dry)