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Pakistan | Family List | Labiatae


Plants with very small corollas, less than 5 mm long.

[N.B.: if no corollas are present on the specimen, the calyx length can often be a guide to corolla length, but a fruiting calyx of 5 mm or more does not necessarily mean that the corolla is 5 mm long or more; in some of the very small-flowered genera the calyces are small or minute in flower but greatly enlarge after anthesis].

Key to Group A

1 Teeth of fruiting calyx plumose and up to c. 6 mm long; corollas soon deciduous; tall sturdy shrub   53 Colebrookea
+ Teeth of fruiting calyx not plumose and less than 5 mm long; corollas soon deciduous or not; annual to perennial herbs, subshrubs or shrubs   (2)
2 (1) Leaves borne in whorls of 3-5   52 Pogostemon
+ Leaves in opposite pairs, sometimes with younger leaves in leaf arils   (3)
3 (2) Upper lip of corolla almost absent; flowers secund in ± elongated cymes   32 Craniotome
+ Upper lip of corolla present; flowers not or scarcely secund in condensed vertical-lasters or loose cymes   (4)
4 (3) Calyx at flowering time clearly differentiated into an upper and lower lip   (5)
+ Calyx at flowering time not or scarcely differentiated into an upper and lower lip   (10)
5 (4) All verticillasters borne in cools of the middle and upper leaves   48 Mentha
+ Only the lowermost or none of the verticillasters borne in upper leaf mils   (6)
6 (5) Leaves sessile [Karachi only]   58 Geniosporum
+ Leaves shortly or clearly petiolate [all areas]   (7)
7 (6) All flowers in congested oblong or ovoid heads   57 Acrocephalus
+ Flowers in ± clearly separated verticillasters   (8)
8 (7) Flowers in 2-flowered verticillasters; nutlets with a prominent raised reticulum   50 Mosla
+ Verticillasters more than 2-flowered; nutlets without a prominent raised reticulum   (9)
9 (8) Upper lobe of calyx 1, large, entire, with decurrent margins; lower lobe of calyx with 4 teeth; stamens 4.   59 Ocimum
+ Upper lobe of calyx shortly 3- toothed, not decurrent; lower lobe of calyx with 2 teeth; stamens 2.   33 Salvia
10 (4) Leaf margins entire; leaves densely gland-dotted on both surfaces   46 Zataria
+ Leaf margins not entire; leaves not densely gland-dotted or not gland dotted   (11)
11 (10) All verticillasters borne in the axils of the middle and upper leaves; plants of wet places   (12)
+ Only lowermost or none of the verticillasters borne in axils of upper leaves   (13)
12 (11) Aromatic plants; corolla 4-lobed; flowers often 1-sexed   48 Mentha
+ Not aromatic plants; corolla 5- lobed; flowers hermaphrodite   47 Lycopus
13 (11) Flowers borne in condensed oblong to cylindrical spikes; nutlets smooth to finely tuberculate   51 Elsholtzia
+ Inflorescence of terminal and lateral loose racemes; verticillasters 2-flowered; nutlets with a raised reticulum   49 Perilla

  • List of lower taxa


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