The Collaborative International Dictionary of English v.0.48:

Sea lavender \Sea" lav"en*der\ (Bot.)
   See Marsh rosemary, under Marsh.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lavender \Lav"en*der\, n. [OE. lavendre, F. lavande, It. lavanda
   lavender, a washing, fr. L. lavare to wash; cf. It.
   lsavendola, LL. lavendula. So called because it was used in
   bathing and washing. See Lave. to wash, and cf.
   Lavender.]
   1. (Bot.) An aromatic plant of the genus Lavandula
      (Lavandula vera), common in the south of Europe. It
      yields and oil used in medicine and perfumery. The Spike
      lavender (Lavandula Spica) yields a coarser oil (oil of
      spike), used in the arts.
      [1913 Webster]

   2. The pale, purplish color of lavender flowers, paler and
      more delicate than lilac.
      [1913 Webster]

   Lavender cotton (Bot.), a low, twiggy, aromatic shrub
      (Santolina Cham[ae]cyparissus) of the Mediterranean
      region, formerly used as a vermifuge, etc., and still used
      to keep moths from wardrobes. Also called ground
      cypress.

   Lavender water, a perfume, toilet water, or shaving lotion
      containing the essential oil of lavender, and sometimes
      the essential oil of bergamot, and essence of ambergris.


   Sea lavender. (Bot.) See Marsh rosemary.

   To lay in lavender.
      (a) To lay away, as clothing, with sprigs of lavender.
      (b) To pawn. [Obs.]
          [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Marsh \Marsh\, n. [OE. mersch, AS. mersc, fr. mere lake. See
   Mere pool, and cf. Marish, Morass.]
   A tract of soft wet land, commonly covered partially or
   wholly with water; a fen; a swamp; a morass. [Written also
   marish.]
   [1913 Webster]

   Marsh asphodel (Bot.), a plant (Nartheeium ossifragum)
      with linear equitant leaves, and a raceme of small white
      flowers; -- called also bog asphodel.

   Marsh cinquefoil (Bot.), a plant (Potentilla palustris)
      having purple flowers, and found growing in marshy places;
      marsh five-finger.

   Marsh elder. (Bot.)
   (a) The guelder-rose or cranberry tree (Viburnum Opulus).
   (b) In the United States, a composite shrub growing in salt
       marshes (Iva frutescens).

   Marsh five-finger. (Bot.) See Marsh cinquefoil (above).


   Marsh gas. (Chem.) See under Gas.

   Marsh grass (Bot.), a genus (Spartina) of coarse grasses
      growing in marshes; -- called also cord grass. The tall
      Spartina cynosuroides is not good for hay unless cut
      very young. The low Spartina juncea is a common
      component of salt hay.

   Marsh harrier (Zool.), a European hawk or harrier (Circus
      aeruginosus); -- called also marsh hawk, moor hawk,
      moor buzzard, puttock.

   Marsh hawk. (Zool.)
   (a) A hawk or harrier (Circus cyaneus), native of both
       America and Europe. The adults are bluish slate above,
       with a white rump. Called also hen harrier, and mouse
       hawk.
   (b) The marsh harrier.

   Marsh hen (Zool.), a rail; esp., Rallus elegans of
      fresh-water marshes, and Rallus longirostris of
      salt-water marshes.

   Marsh mallow (Bot.), a plant of the genus Althaea (
      Althaea officinalis) common in marshes near the
      seashore, and whose root is much used in medicine as a
      demulcent.

   Marsh marigold. (Bot.) See in the Vocabulary.

   Marsh pennywort (Bot.), any plant of the umbelliferous
      genus Hydrocotyle; low herbs with roundish leaves,
      growing in wet places; -- called also water pennywort.


   Marsh quail (Zool.), the meadow lark.

   Marsh rosemary (Bot.), a plant of the genus Statice
      (Statice Limonium), common in salt marshes. Its root is
      powerfully astringent, and is sometimes used in medicine.
      Called also sea lavender.

   Marsh samphire (Bot.), a plant (Salicornia herbacea)
      found along seacoasts. See Glasswort.

   Marsh St. John's-wort (Bot.), an American herb (Elodes
      Virginica) with small opposite leaves and flesh-colored
      flowers.

   Marsh tea. (Bot.). Same as Labrador tea.

   Marsh trefoil. (Bot.) Same as Buckbean.

   Marsh wren (Zool.), any species of small American wrens of
      the genus Cistothorus, and allied genera. They chiefly
      inhabit salt marshes.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sea lavender
    n 1: any of various plants of the genus Limonium of temperate
         salt marshes having spikes of white or mauve flowers [syn:
         sea lavender, marsh rosemary, statice]