Nor are the ficus trees, the Bermuda cedars, the pandanus, the Cape yews, and the remarkably vigorous ginger which cover the top of the mountain's northern slopes.
Be it flying the Confederate flag, gutting the Voting Rights Act, attacking Obamacare or affirmative action the vigorous ideological debates covered up huge racial conflict.
The questionnaire encompassed an extensive list of examples of moderate and vigorous activities that covered household, occupational, and recreational or sporting activities.
For this audience, Fox has assembled a vigorous corps of reporters who cover the White House and foreign affairs in a way that appeals to viewers like Leslie Gelb.
It covers both a vigorous military policy (it was Mr Blair's government that was busy bombing Iraq last month) and narrowed eyes about immigration (France's Socialist prime minister, Lionel Jospin, enraged his Green friends by denying papers to 63,000 illegal immigrants last year).But the most basic change is in economics.
Non-disease conditions, including mental or physical stress, such as vigorous exercise, which might be covered by an extra 5 mg dose of hydrocortisone, for example, are excluded.
These reduced rates were perhaps originally intended to favour the spread of education but quickly expanded, under the vigorous pressure of vested interests, to cover all sorts of commercial documents, advertising matter, magazines, etc.
In the 1950s and 1960s he covered large canvases with vigorous brushstrokes and lush blooms of saturated colour, earning rich admirers, solo shows and copycats.
There was an unusually vigorous response to this week's Covers Contest, the result, perhaps, of some unknown viral marketing campaign, or maybe it was the evergreen popularity of time travel, which was the organizing rubric of these four books.
